Pew-Takedown
Guide only. Educational guide only. Some information comes from non-authoritative sources. Always consult your manufacturer's manual and a licensed gunsmith. Verify your firearm is unloaded before every procedure. Read the full disclaimer.

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Glock 17 Gen5

field strip ~1 min · reassembly ~1 min · detail strip ~20 min

Before you begin Verify this firearm is unloaded. Remove the magazine or empty the cylinder or tube, lock the action open, and check the chamber both by sight and by touch. Keep the muzzle in a safe direction and remove all live ammunition from your work area.
Glock Ges.m.b.H. limits owner disassembly The maker's own procedure goes as far as: Field strip only: slide, recoil spring assembly, barrel and frame.. GLOCK tells owners never to disassemble the pistol beyond the field strip; any further disassembly must be done by a GLOCK-Certified Armorer, and otherwise voids the warranty. (GLOCK Owner's Manual — Models G17 to G48 (Instructions for Use) — GLOCK Ges.m.b.H., p. 24 eu-assets.contentstack.com [1])

Specifications

Manufacturer
Glock Ges.m.b.H.
Origin
Austria
Category
Pistol
Action
Striker-fired, short recoil
Calibers
9x19mm Parabellum
Capacity
17+1 with the standard magazine
Production
2017–present (in-production)
Also known as
G17 Gen5, Glock 17 MOS Gen5

Model-specific safety

Trigger press required to disassemble This design requires pressing the trigger as part of the takedown. That makes verifying an empty chamber non-negotiable. Check it twice, keep the muzzle in a safe direction, and never take a shortcut on this step.

Under spring tension

Easily lost parts

Slide lock spring (detail strip only) · Firing pin safety plunger and spring (detail strip only)

Tools

ToolRequiredUsed forSubstitute
Glock armorer's punch (3/32 in / 2.4 mm)OptionalDetail strip only. Not needed for field stripping.A 3/32 in pin punch works for most pins.

Shop difficulty

Shop tier 1 Tier 1 — easy among pistols, for the full job: strip to the parts that get coated and put it back together working. About 35 line items in GLOCK's Gen5 list including the magazine (no locking block pin); punch-only work. The only fiddly parts are the slide cover plate (spacer sleeve and bearing held down) and the small coil spring on the Gen5 ambidextrous slide stop lever. Same platform as the Glock 19 (the reference Tier 1 pistol).

Parts: 35 numbered parts (Complete pistol incl. magazine; the parts list on this page = GLOCK's p. 48 list with the G17 Gen5 drawing (items 25 and 30 printed as --- and left out); 35 pieces), from GLOCK Owner's Manual — Models G17 to G48 (Instructions for Use) — GLOCK Ges.m.b.H., p. 48 eu-assets.contentstack.com [1].

Bench time: about 15 min to strip, 20 min to rebuild (estimate). Estimate for an experienced tech with the right tools, detail strip to coatable parts (slide internals, frame pins, trigger group, sights) and rebuild to a function-checked gun; scale used across pistols: Glock-pattern 15/20 min, other strikers 20-30/25-40, DA/SA hammer guns 30-35/45-50, Hi-Power, Colt 1903 and Mark 23 40-45/60-75. Few pins;

Small parts: 6 pins, 6 springs, 2 detents or plungers (counted from the manufacturer's parts list (one per key number unless a quantity is given))

What comes off for coating

Special tools

Known pain points

Fit or check on rebuild

This is Pew-Takedown's rating, not the manufacturer's. How tiers are rated. Forum reports are owners' experience, not specifications.

Procedures

Clear and Make Safe

Clear & Make Safe

Do this every single time, even if you unloaded the pistol five minutes ago.

  1. Point the muzzle in a safe direction and keep your finger off the trigger.
    WarningKeep the muzzle in a safe direction for the entire procedure, not just this step.
  2. Press the magazine release and remove the magazine. Set it aside, away from the work area.
    Removed at this step: Magazine
  3. Retract the slide fully to eject any chambered round, and lock it open using the slide stop lever.
  4. Look into the chamber and the magazine well. Confirm both are empty.
    TipGood light matters. A phone flashlight into the ejection port is worth the two seconds.
  5. Insert a finger into the chamber and physically feel that it is empty.
    WarningDo not skip the physical check. Brass in a dim chamber can look like an empty chamber.
  6. Remove all live ammunition from your work surface before continuing.

Field Strip

Field Strip

The factory manual's sequence. Four parts, no tools, and identical across the Glock line.

  1. Complete the Clear and Make Safe procedure, and put on safety glasses.
    WarningThe manual requires safety glasses when disassembling — components are under spring pressure.
  2. Release the slide to the forward position, either by pressing the slide stop lever down or by pulling the slide fully back and releasing it.
  3. With the muzzle pointed in a safe direction, pull the trigger. The trigger must be in its rearmost position for the slide to come off.
    WarningVerify the chamber is empty before this step. If the trigger is in the forward position, the pistol may be loaded.
  4. Hold the pistol with your firing hand, fingers across the top of the rear of the slide in front of the rear sight and thumb on the rear of the frame.
  5. Using your fingers, retract the slide about 1/8 in (3 mm) and hold it there.
    TipPull it too far and the trigger resets to the forward position. If that happens, pull the trigger again with the muzzle in a safe direction and start over.
  6. Using the thumb and index finger of your non-firing hand, pull the slide lock down evenly on both sides.
  7. While holding the slide lock down, push the slide forward and off the frame.
    Removed at this step: Slide assembly
  8. Press the recoil spring assembly toward the front (muzzle end) of the slide while pulling it up to remove it.
    WarningIt is under spring tension. Keep control of it.
    Removed at this step: Recoil spring assembly
  9. Holding the barrel by the barrel locking cams, lift it and push it toward the front of the slide, then pull it up and toward the rear to remove it.
    TipForward first, then up and rearward. It does not simply lift out.
    Removed at this step: Barrel
  10. Stop here for routine cleaning. The frame and slide internals do not need to come apart for normal maintenance.

Reassembly

Reassembly

Reverse of the field strip. The recoil spring assembly seats in the barrel lug cut, not on the barrel itself.

  1. Hold the slide upside down, insert the barrel, and seat it fully by its locking cams.
  2. Insert one end of the recoil spring assembly into the slide and press the other end toward the front of the slide to compress the spring, pushing down until the large end rests in the second, semi-circular notch on the barrel locking cams.
    TipThe second semi-circular notch on the locking cams is the seat. If the assembly keeps popping out, it is not in that notch.
  3. Holding the frame in your firing hand with your finger off the trigger and outside the trigger guard, place the slide on top of the frame in front of the slide rails.
  4. Push the slide toward the back of the frame until the slide lock snaps up and locks the slide into place.
    WarningDo not hold the slide lock down during reassembly. It snaps up on its own.
  5. Release the slide and let it run forward into battery, then perform the function check.

Detail Strip — Slide

Detail Strip tools required

Removes the striker, striker spring, firing pin safety, extractor, and slide cover plate.

  1. Field strip the pistol and set the frame, barrel, and recoil spring assembly aside.
  2. Hold the slide upside down. Use a punch to press the spacer sleeve (the striker assembly's rear post) forward and down, away from the slide cover plate.
    TipThe parts behind the cover plate are spring-loaded. Keep a thumb over the plate as you slide it.
  3. Slide the slide cover plate downward and off while keeping the spring-loaded parts contained with your thumb.
    WarningThe spring-loaded bearing and extractor depressor plunger assembly sit directly behind this plate and will launch if released. Do this in a clear area, ideally inside a clear bag, and wear eye protection.
    Removed at this step: Slide cover plate
  4. Remove the spring-loaded bearing and the extractor depressor plunger assembly from the rear of the slide.
    Removed at this step: Spring-loaded bearing Extractor depressor plunger assembly
  5. Tip the slide and remove the striker (firing pin) assembly out of the rear of the slide.
    Removed at this step: Striker assembly
  6. Press the firing pin safety plunger down from inside the slide and remove it and its spring.
    Removed at this step: Firing pin safety Firing pin safety spring
  7. Tip the extractor out of its cut in the slide.
    Removed at this step: Extractor
  8. Reassemble in reverse order. Confirm the extractor moves freely and the firing pin safety plunger springs back up before reinstalling the cover plate.
    WarningIf the firing pin safety does not return under spring pressure, do not reassemble the pistol. That safety is what prevents the striker from moving forward if the pistol is dropped.

Patent drawings

not under copyright

Drawings from US patents on this design. A patent shows the invention as the inventor filed it; the firearm that shipped can differ in detail, and later production often does. Use them to see how the parts relate, not as a parts reference or a procedure. Per the USPTO, the text and drawings of a patent are typically not subject to copyright; each patent here was checked for a copyright notice.

US Patent 11,555,662 — Multifunctional slide cover plate

Josef Kroyer, Leopold Oppenauer · assigned to Glock Technology GmbH · filed 2021-09-15 · granted 2023-01-17. Full patent (USPTO)

The slide cover plate at the rear of the slide, presented with an exploded view of the pistol's main assemblies (slide, barrel, recoil spring assembly, frame).

Why this is the Glock 17 Gen5’s patent: listed on the maker’s patent-marking page — Virtual Patent Marking of GLOCK® Products (Version 1, Released: August, 2026) — GLOCK (linked as 'Patents' from the us.glock.com site footer), p. 1, row G17, column US11555662B2 eu-assets.contentstack.com [18]: “The following GLOCK® Products, the according models and product generations, and components thereof may be protected by one or more of the following Patents and Designs. … G17 … US11555662B2”

US Patent 11,555,662, Sheet 1 of 6 — Fig. 1, Fig. 2A, Fig. 2B, Fig. 2C, Fig. 2D
US Patent 11,555,662, Sheet 1 of 6 — Fig. 1, Fig. 2A, Fig. 2B, Fig. 2C, Fig. 2D The patent: “FIG. 1 is schematic exploded view of a pistol. FIG. 2A depicts a prior art slide cover plate. FIG. 2B depicts an illustrative embodiment of a slide cover plate, according to the present disclosure. FIG. 2C depicts an alternative illustrative embodiment of a slide cover plate, according to the present disclosure. FIG. 2D depicts another alternative illustrative embodiment of a slide cover plate, according to the present disclosure.” Drawn for the patent, as filed; the production firearm may differ in detail. US Patent 11,555,662 — Multifunctional slide cover plate, Sheet 1 of 6 — United States Patent and Trademark Office. Source. US patent drawing, not subject to copyright.
US Patent 11,555,662, Sheet 2 of 6 — Fig. 3A, Fig. 3B, Fig. 4, Fig. 5
US Patent 11,555,662, Sheet 2 of 6 — Fig. 3A, Fig. 3B, Fig. 4, Fig. 5 The patent: “FIG. 3A depicts a pistol slide including a slide cover plate according to the present disclosure in the closed position. FIG. 3B depicts the pistol slide and slide cover plate of FIG. 3A in the closed position. FIG. 4 depicts a cross section view along a vertical plane that includes the longitudinal axis A-A′ as shown in FIG. 3A. FIG. 5 depicts a cross section view along a vertical plane that includes the longitudinal axis B-B′ as shown in FIG. 3B.” Drawn for the patent, as filed; the production firearm may differ in detail. US Patent 11,555,662 — Multifunctional slide cover plate, Sheet 2 of 6 — United States Patent and Trademark Office. Source. US patent drawing, not subject to copyright.

US Patent 11,946,709 — Firearm including an extractor assembly

Martin Mortsch, Philipp Kogler · assigned to Glock Technology GmbH · filed 2021-01-14 · granted 2024-04-02. Full patent (USPTO)

The extractor, spring-loaded plunger and holding frame in the slide, and their removal with a tool through a maintenance bore.

Why this is the Glock 17 Gen5’s patent: listed on the maker’s patent-marking page — Virtual Patent Marking of GLOCK® Products (Version 1, Released: August, 2026) — GLOCK (linked as 'Patents' from the us.glock.com site footer), p. 1, row G17, column US11946709B2 eu-assets.contentstack.com [18]: “The following GLOCK® Products, the according models and product generations, and components thereof may be protected by one or more of the following Patents and Designs. … G17 … US11946709B2”

US Patent 11,946,709, Sheet 1 of 7 — Fig. 1, Fig. 2
US Patent 11,946,709, Sheet 1 of 7 — Fig. 1, Fig. 2 The patent: “FIG. 1 is a simplified exploded view of a slide according to the prior art. FIG. 2 is a simplified exploded view of a slide having an illustrative extractor assembly according to an embodiment of the present disclosure.” Drawn for the patent, as filed; the production firearm may differ in detail. US Patent 11,946,709 — Firearm including an extractor assembly, Sheet 1 of 7 — United States Patent and Trademark Office. Source. US patent drawing, not subject to copyright.
US Patent 11,946,709, Sheet 2 of 7 — Fig. 3, Fig. 4
US Patent 11,946,709, Sheet 2 of 7 — Fig. 3, Fig. 4 The patent: “FIG. 3 is a horizontal sectional view of the slide of FIG. 1 in the region III-III′. FIG. 4 is a horizontal sectional view of the slide of FIG. 2 in the region IV-IV′.” Drawn for the patent, as filed; the production firearm may differ in detail. US Patent 11,946,709 — Firearm including an extractor assembly, Sheet 2 of 7 — United States Patent and Trademark Office. Source. US patent drawing, not subject to copyright.
US Patent 11,946,709, Sheet 4 of 7 — Fig. 7A, Fig. 7B, Fig. 7C
US Patent 11,946,709, Sheet 4 of 7 — Fig. 7A, Fig. 7B, Fig. 7C The patent: “FIGS. 7A-7C schematically illustrate an illustrative disassembly process for a firearm having an extractor assembly of the present disclosure. FIG. 7A depicts the insertion of a tool. FIG. 7B depicts the release of the extractor, and FIG. 7C depicts the extractor removed.” Drawn for the patent, as filed; the production firearm may differ in detail. US Patent 11,946,709 — Firearm including an extractor assembly, Sheet 4 of 7 — United States Patent and Trademark Office. Source. US patent drawing, not subject to copyright.

US Patent 8,156,677 — Assemblies and firearms incorporating such assemblies

Gaston Glock · filed 2010-04-15 · granted 2012-04-17. Full patent (USPTO)

The interchangeable backstrap on the polymer grip and the pin that both holds the backstrap and retains the trigger mechanism housing in the receiver, shown on a complete Glock-type pistol including a full exploded view.

Why this is the Glock 17 Gen5’s patent: listed on the maker’s patent-marking page — Virtual Patent Marking of GLOCK® Products (Version 1, Released: August, 2026) — GLOCK (linked as 'Patents' from the us.glock.com site footer), p. 1, row G17, column US8156677B2 eu-assets.contentstack.com [18]: “The following GLOCK® Products, the according models and product generations, and components thereof may be protected by one or more of the following Patents and Designs. … G17 … US8156677B2”

US Patent 8,156,677, Sheet 1 of 7 — FIG. 1
US Patent 8,156,677, Sheet 1 of 7 — FIG. 1 The patent: “FIG. 1 is a partially cut-away, side view of an embodiment of a firearm without an attachment.” Drawn for the patent, as filed; the production firearm may differ in detail. US Patent 8,156,677 — Assemblies and firearms incorporating such assemblies, Sheet 1 of 7 — United States Patent and Trademark Office. Source. US patent drawing, not subject to copyright.
US Patent 8,156,677, Sheet 2 of 7 — FIG. 2, FIG. 3
US Patent 8,156,677, Sheet 2 of 7 — FIG. 2, FIG. 3 The patent: “FIG. 2 is a partially exploded, perspective view of the firearm of FIG. 1, showing detail of an embodiment of an attachment and a fixing pin. FIG. 3 is a partially cut-away, side view of the firearm of FIGS. 1 and 2, with the attachment and fixing pin mounted.” Drawn for the patent, as filed; the production firearm may differ in detail. US Patent 8,156,677 — Assemblies and firearms incorporating such assemblies, Sheet 2 of 7 — United States Patent and Trademark Office. Source. US patent drawing, not subject to copyright.
US Patent 8,156,677, Sheet 4 of 7 — FIG. 5
US Patent 8,156,677, Sheet 4 of 7 — FIG. 5 The patent: “FIG. 5 is a side view of an embodiment of a firearm with multiple attachments.” Drawn for the patent, as filed; the production firearm may differ in detail. US Patent 8,156,677 — Assemblies and firearms incorporating such assemblies, Sheet 4 of 7 — United States Patent and Trademark Office. Source. US patent drawing, not subject to copyright.
US Patent 8,156,677, Sheet 5 of 7 — FIG. 6
US Patent 8,156,677, Sheet 5 of 7 — FIG. 6 The patent: “FIG. 6 is an exploded view showing the embodiment of FIG. 5 in greater detail.” Drawn for the patent, as filed; the production firearm may differ in detail. US Patent 8,156,677 — Assemblies and firearms incorporating such assemblies, Sheet 5 of 7 — United States Patent and Trademark Office. Source. US patent drawing, not subject to copyright.

Torque specifications

Use a calibrated torque driverValues are the manufacturer's, shown in the unit it gives first; conversions are calculated and rounded. Tighten to the stated value — not "until it feels right" — and follow any sequence noted.
FastenerTorqueSequence, notes and the source's wordsWhere it comes from
MOS adapter plate screws (2 × M3x6 Torx, T10)
GLOCK pistol models in MOS configuration with GLOCK MOS Adapter Plates 01–08 (this model: G17 Gen5 MOS (and G17 Gen4 MOS))		 1.5 N·m
13 in-lb · 1.1 ft-lb

Field strip; place slide flat. Remove the GLOCK cover plate (the removed screws should not be used for fixing the adapter plates). Select the plate, markings facing up. Tighten the 2 screws (the set's M3x6 Torx screws, which come with a drop of glue applied). 'Make sure to use only these screws for fixing the adapter plates.' Verify tightness of the screws depending on ammunition and frequency of use; if you often screw on and unscrew, apply another drop of threadlocking adhesive to the screw threads.

Threadlocker: Screws come with drop of glue applied; re-apply a drop of threadlocking type adhesive if screws are often removed

“If a torque wrench is available the optimum fit is 1.5 Nm / 13.3 lbf. inch.”

 GLOCK MOS Adapter-Set (Modular Optic System) instruction sheet (© GLOCK 2020, 31798), linked from us.glock.com Owners Resources > Downloadable Materials as 'MOS Adapter Plate Instructions' — GLOCK, PDF p. 1 (Cleaning and Service > SERVICE eu-assets.contentstack.com [3]

Reported by other sources — not the manufacturer

Not a manufacturer specificationThese values come from the people and publications named beside each one, not from Glock Ges.m.b.H., and where they differ from the manufacturer's values above, the manufacturer wins. They are recorded with who said them and their exact words so you can judge them — not as a recommendation. Confirm any of them with the manufacturer or a licensed gunsmith before you put a wrench on your firearm; a wrong value can crack a stock, strip a thread or loosen a muzzle device.
FastenerTorqueWho says so, and their wordsWhere it comes from
Front sight screw
GLOCK pistols; Night Fision front sight with the Night Fision screw		 5–7 in-lb
0.56–0.79 N·m · 0.42–0.58 ft-lb

Reported by Night Fision (sight maker) support knowledge base
Secondary — a parts or tool maker, or a gunsmithing publisher

Threadlocker: "de-grease and apply high strength thread locker to the front sight screw when installing" (Night Fision screws come with thread locker pre-applied per its install guide)

“The recommendation for a Glock front sight screw is to use 5-7 in/lbs. (0.565-0.791 N-m) of torque.”

 What is the Glock Front Sight Screw Torque Spec? — Night Fision (sight maker) support knowledge base nightfisionorg.freshdesk.com [4]
Front sight screw
GLOCK pistols; Night Fision front sight with the Night Fision screw		 max. 10 in-lb
1.1 N·m · 0.83 ft-lb

Reported by Night Fision (sight maker) support knowledge base
Secondary — a parts or tool maker, or a gunsmithing publisher

“DO NOT EXCEED 10in/lbs. (1.13 N-m) of torque or risk of failure is very high.”

 What is the Glock Front Sight Screw Torque Spec? — Night Fision (sight maker) support knowledge base nightfisionorg.freshdesk.com [4]
Front sight screw
GLOCK pistols; AmeriGlo front sight with AmeriGlo screw		 10 in-lb
1.1 N·m · 0.83 ft-lb

Reported by AmeriGlo (sight maker)
Secondary — a parts or tool maker, or a gunsmithing publisher

Hold the front blade square and firmly during final tightening; the screw must stay seated squarely in the head (sight most likely to rotate off-center then).

Threadlocker: "a very small drop of Loctite on the end threads of the screw"

“The screw should be tightened snugly (wrist-tight, 10 in-lbs) against the bottom of the slide.”

 Sight Installation Instructions — AmeriGlo (sight maker) ameriglo.com [5]
Optic plate to slide screws (M3 x 0.5 x 6 mm)
Glock 17 MOS (Gen 4/5) with Forward Controls Design OPF-G, RMR plate (Trijicon RMR/SRO/RMR HD/RCR)		 13 in-lb
1.5 N·m · 1.1 ft-lb

Reported by Forward Controls Design
Secondary — a parts or tool maker, or a gunsmithing publisher

Threadlocker: VC-3 (Vibra-Tite) packet supplied with the plate

“Plate to slide torque value: 13in/lb”

 OPF-G, RMR (product page) — Forward Controls Design forwardcontrolsdesign.com [6]
Optic (sight) to plate screws
Glock 17 MOS (Gen 4/5) with Forward Controls Design OPF-G, RMR plate (Trijicon RMR/SRO/RMR HD/RCR)		 13 in-lb
1.5 N·m · 1.1 ft-lb

Reported by Forward Controls Design
Secondary — a parts or tool maker, or a gunsmithing publisher

“Sight to plate torque value: 13in/lb”

 OPF-G, RMR (product page) — Forward Controls Design forwardcontrolsdesign.com [6]
Optic plate to slide screws
Glock 17 MOS with Forward Controls Design OPF-G, RMRcc plate (Trijicon RMRcc)		 13 in-lb
1.5 N·m · 1.1 ft-lb

Reported by Forward Controls Design
Secondary — a parts or tool maker, or a gunsmithing publisher

“Plate to slide: 13 in/lb.”

 OPF-G, RMRcc (product page) — Forward Controls Design forwardcontrolsdesign.com [7]
Optic (sight) to plate screws
Glock 17 MOS with Forward Controls Design OPF-G, RMRcc plate (Trijicon RMRcc)		 18 in-lb
2 N·m · 1.5 ft-lb

Reported by Forward Controls Design
Secondary — a parts or tool maker, or a gunsmithing publisher

“Sight to plate: 18 in/lb.”

 OPF-G, RMRcc (product page) — Forward Controls Design forwardcontrolsdesign.com [7]
Optic plate to slide screws
Glock 17 MOS (Gen 4/5) with Forward Controls Design OPF-G, ACRO plate		 13 in-lb
1.5 N·m · 1.1 ft-lb

Reported by Forward Controls Design
Secondary — a parts or tool maker, or a gunsmithing publisher

“Torque value for plate to slide: 13 in·lb.”

 OPF-G, ACRO / MPS (product page) — Forward Controls Design forwardcontrolsdesign.com [8]
Aimpoint ACRO P1/P2 mounting screw
Glock 17 MOS (Gen 4/5) with Forward Controls Design OPF-G, ACRO plate, Aimpoint ACRO P1/P2		 26 in-lb
2.9 N·m · 2.2 ft-lb

Reported by Forward Controls Design
Secondary — a parts or tool maker, or a gunsmithing publisher

“Torque value for ACRO P1/P2 mounting screw: 26 in·lb. For Steiner MPS, 18 in·lb. (updated by Steiner in 2024)”

 OPF-G, ACRO / MPS (product page) — Forward Controls Design forwardcontrolsdesign.com [8]
Steiner MPS mounting screw
Glock 17 MOS (Gen 4/5) with Forward Controls Design OPF-G, ACRO plate, Steiner MPS		 18 in-lb
2 N·m · 1.5 ft-lb

Reported by Forward Controls Design
Secondary — a parts or tool maker, or a gunsmithing publisher

“Torque value for ACRO P1/P2 mounting screw: 26 in·lb. For Steiner MPS, 18 in·lb. (updated by Steiner in 2024)”

 OPF-G, ACRO / MPS (product page) — Forward Controls Design forwardcontrolsdesign.com [8]
Optic plate to slide screws (M3 x 0.5 x 6 mm)
Glock 17 MOS with Forward Controls Design OPF-G, EFLX plate (EOTech EFLX)		 13 in-lb
1.5 N·m · 1.1 ft-lb

Reported by Forward Controls Design
Secondary — a parts or tool maker, or a gunsmithing publisher

“Plate to slide: 13in/lb”

 OPF-G, EFLX (product page) — Forward Controls Design forwardcontrolsdesign.com [9]
Optic (sight) to plate screws
Glock 17 MOS with Forward Controls Design OPF-G, EFLX plate (EOTech EFLX)		 20–25 in-lb
2.3–2.8 N·m · 1.7–2.1 ft-lb

Reported by Forward Controls Design
Secondary — a parts or tool maker, or a gunsmithing publisher

“Sight to plate: 20 to 25 in/lb”

 OPF-G, EFLX (product page) — Forward Controls Design forwardcontrolsdesign.com [9]
Optic plate mounting screws (M3 x 6 mm FH)
Glock 17 MOS with C&H Precision V4 MIL/LEO adapter plate (RMR footprint)		 12–15 in-lb
1.4–1.7 N·m · 1–1.2 ft-lb

Reported by C&H Precision Weapons
Secondary — a parts or tool maker, or a gunsmithing publisher

“Qty 3 – M3 x 6 MM FH Plate Mounting Screws, Torque between 12-15in/lbs”

 V4 MIL/LEO Adapter Trijicon RMR / RMR HD / SRO / Holosun 407C / 507C / 507Comp / 508T ... Fits GLOCK MOS (product page) — C&H Precision Weapons chpws.com [10]
Optic to plate screws, Trijicon RMR (4-40 x .320 FHB)
Glock 17 MOS with C&H Precision V4 MIL/LEO adapter plate (RMR footprint), Trijicon RMR		 12–15 in-lb
1.4–1.7 N·m · 1–1.2 ft-lb

Reported by C&H Precision Weapons
Secondary — a parts or tool maker, or a gunsmithing publisher

“Qty 3 – 4-40 x .320 FHB Trijicon RMR Optic Mounting Screws, Torque between 12-15in/lbs”

 V4 MIL/LEO Adapter Trijicon RMR / RMR HD / SRO / Holosun 407C / 507C / 507Comp / 508T ... Fits GLOCK MOS (product page) — C&H Precision Weapons chpws.com [10]
Optic to plate screws, Holosun 507C/508T (4-40 x .280 FHB)
Glock 17 MOS with C&H Precision V4 MIL/LEO adapter plate (RMR footprint), Holosun 507C/508T		 12–15 in-lb
1.4–1.7 N·m · 1–1.2 ft-lb

Reported by C&H Precision Weapons
Secondary — a parts or tool maker, or a gunsmithing publisher

“Qty 3 – 4-40 x .280 FHB Holosun 507C / 508T Optic Mounting Screws, Torque between 12-15in/lbs”

 V4 MIL/LEO Adapter Trijicon RMR / RMR HD / SRO / Holosun 407C / 507C / 507Comp / 508T ... Fits GLOCK MOS (product page) — C&H Precision Weapons chpws.com [10]
Optic adapter plate mounting screws (Holosun RMR-footprint plate for Glock MOS)
Glock 17 MOS with HOLOSUN adapter plate for RMR footprint (Holosun 407C/507C/508T, Trijicon RMR)		 1.4 N·m
12 in-lb · 1 ft-lb

Reported by HOLOSUN Europe (holosun.eu, operated by Picotronic GmbH, HOLOSUN European distributor)
Secondary — a parts or tool maker, or a gunsmithing publisher

“Tightening torque recommended: 1,4 Nm”

 Adapter plate for Glock MOS (except 43/43X/48 MOS), for RMR footprint (product page) — HOLOSUN Europe (holosun.eu, operated by Picotronic GmbH, HOLOSUN European distributor) holosun.eu [11]
Optic adapter plate mounting screws (Holosun RMR-footprint plate for Glock MOS)
Glock 17 MOS with HOLOSUN adapter plate for RMR footprint (Holosun 407C/507C/508T, Trijicon RMR)		 max. 1.7 N·m
15 in-lb · 1.3 ft-lb

Reported by HOLOSUN Europe (holosun.eu, operated by Picotronic GmbH, HOLOSUN European distributor)
Secondary — a parts or tool maker, or a gunsmithing publisher

“tightening torque Maximum: 1,7 Nm”

 Adapter plate for Glock MOS (except 43/43X/48 MOS), for RMR footprint (product page) — HOLOSUN Europe (holosun.eu, operated by Picotronic GmbH, HOLOSUN European distributor) holosun.eu [11]
Optic adapter plate mounting screws (Holosun K/EPS-footprint plate for Glock MOS)
Glock 17 MOS with HOLOSUN adapter plate for 407K/507K/EPS Carry/EPS		 1.4 N·m
12 in-lb · 1 ft-lb

Reported by HOLOSUN Europe (holosun.eu, operated by Picotronic GmbH, HOLOSUN European distributor)
Secondary — a parts or tool maker, or a gunsmithing publisher

“Tightening torque recommended: 1,4 Nm”

 Adapter plate for Glock MOS (except 43X/48 MOS), compatible with Holosun 407K/507K/EPS Carry/EPS (product page) — HOLOSUN Europe (holosun.eu, operated by Picotronic GmbH, HOLOSUN European distributor) holosun.eu [12]
Optic adapter plate mounting screws (Holosun K/EPS-footprint plate for Glock MOS)
Glock 17 MOS with HOLOSUN adapter plate for 407K/507K/EPS Carry/EPS		 max. 1.7 N·m
15 in-lb · 1.3 ft-lb

Reported by HOLOSUN Europe (holosun.eu, operated by Picotronic GmbH, HOLOSUN European distributor)
Secondary — a parts or tool maker, or a gunsmithing publisher

“tightening torque Maximum: 1,7 Nm”

 Adapter plate for Glock MOS (except 43X/48 MOS), compatible with Holosun 407K/507K/EPS Carry/EPS (product page) — HOLOSUN Europe (holosun.eu, operated by Picotronic GmbH, HOLOSUN European distributor) holosun.eu [12]
Optic adapter plate mounting screws (Holosun 509T plate for Glock 17/19 MOS)
Glock 17 MOS with HOLOSUN 509T adapter plate		 1.4 N·m
12 in-lb · 1 ft-lb

Reported by HOLOSUN Europe (holosun.eu, operated by Picotronic GmbH, HOLOSUN European distributor)
Secondary — a parts or tool maker, or a gunsmithing publisher

“Tightening torque recommended: 1,4 Nm”

 Adapter plate compatible with Holosun 509T for Glock 17 19 MOS (product page) — HOLOSUN Europe (holosun.eu, operated by Picotronic GmbH, HOLOSUN European distributor) holosun.eu [13]
Optic adapter plate mounting screws (Holosun 509T plate for Glock 17/19 MOS)
Glock 17 MOS with HOLOSUN 509T adapter plate		 max. 1.7 N·m
15 in-lb · 1.3 ft-lb

Reported by HOLOSUN Europe (holosun.eu, operated by Picotronic GmbH, HOLOSUN European distributor)
Secondary — a parts or tool maker, or a gunsmithing publisher

“tightening torque Maximum: 1,7 Nm”

 Adapter plate compatible with Holosun 509T for Glock 17 19 MOS (product page) — HOLOSUN Europe (holosun.eu, operated by Picotronic GmbH, HOLOSUN European distributor) holosun.eu [13]
Red-dot optic mounting screws (6-32 flat head, supplied) into EGW rear-dovetail sight mount
Glock 17 (non-MOS slide only; EGW: 'Does not fit ANY/ALL Glock MOS models') with the EGW 'Trijicon RMR / SRO, Holosun 407c / 507c Sight Mount for Glock' (replaces the rear sight; for Trijicon RMR/SRO,		 15 in-lb
1.7 N·m · 1.2 ft-lb

Reported by Evolution Gun Works (EGW)
Secondary — a parts or tool maker, or a gunsmithing publisher

Remove the rear sight, install the EGW mount in the dovetail, tighten the set screw if applicable, place the optic on the mount, then apply blue Loctite and torque the optic screws.

Threadlocker: Blue Loctite on the provided mounting screws (EGW instructions)

“Torque mounting screws to 15in/lbs”

 Trijicon RMR / SRO, Holosun 407c / 507c Sight Mount for Glock (EGW product page, installation instructions section) — Evolution Gun Works (EGW) egwguns.com [14]
Red-dot optic mounting screws (supplied) into EGW rear-dovetail sight mount (Docter/Venom/Viper/FastFire footprint)
Glock 17 (non-MOS slide only; EGW: 'Does not fit ANY/ALL Glock MOS models') with the EGW 'Glock Red Dot Mount | Fits Vortex Venom, Viper & Burris FastFire | EGW' (replaces the rear sight)		 15 in-lb
1.7 N·m · 1.2 ft-lb

Reported by Evolution Gun Works (EGW)
Secondary — a parts or tool maker, or a gunsmithing publisher

Remove the rear sight, install the EGW mount in the dovetail, tighten the set screw if applicable, place the optic on the mount, then apply blue Loctite and torque the optic screws.

Threadlocker: Blue Loctite on the provided mounting screws (EGW instructions)

“Torque mounting screws to 15 in/lbs”

 Glock Red Dot Mount | Fits Vortex Venom, Viper & Burris FastFire | EGW (EGW product page, installation instructions section) — Evolution Gun Works (EGW) egwguns.com [15]
XS optic plate to slide screws
Glock 17 MOS with the XS Glock MOS Optic Plate (RMR or ACRO footprint; XS lists 'Glock MOS 17, 19, 34, 45, 47, & 49') (fitment per XS product page https://xssights.com/products/glock-mos-optic-plate-f		 6–8 in-lb
0.68–0.9 N·m · 0.5–0.67 ft-lb

Reported by XS Sights
Secondary — a parts or tool maker, or a gunsmithing publisher

Degrease, apply the supplied blue threadlocker, start both screws before torquing, then tighten one at a time. XS recommends 12-24 h Loctite cure before shooting and witness-marking the screws.

Threadlocker: Supplied blue threadlocker

“Tighten screws one at a time to a final torque spec of 6-8 inch pounds.”

 XS Sights — Installation Instructions, XS Optic Plates (PDF linked from the XS product page) — XS Sights, PDF p. 1, step 10 xssights.com [16]
Optic to XS optic plate screws
Glock 17 MOS with the XS Glock MOS Optic Plate (RMR or ACRO footprint; XS lists 'Glock MOS 17, 19, 34, 45, 47, & 49') (fitment per XS product page https://xssights.com/products/glock-mos-optic-plate-f		 6–8 in-lb
0.68–0.9 N·m · 0.5–0.67 ft-lb

Reported by XS Sights
Secondary — a parts or tool maker, or a gunsmithing publisher

Degrease, apply the supplied blue threadlocker, start both screws before torquing, then tighten one at a time. XS recommends 12-24 h Loctite cure before shooting and witness-marking the screws.

Threadlocker: Supplied blue threadlocker

“Tighten optic to plate screws with a final torque spec of 6-8 inch pounds.”

 XS Sights — Installation Instructions, XS Optic Plates (PDF linked from the XS product page) — XS Sights, PDF p. 1, step 13 xssights.com [16]
DeltaPoint Pro M4x.7x15.8mm Torx screws through Leupold mount base into dovetail
Glock 17 (rear-sight dovetail slide) with Leupold DeltaPoint Pro on the Leupold Glock base/dovetail (SKU 170906)		 25 in-lb
2.8 N·m · 2.1 ft-lb

Reported by Leupold & Stevens, Inc.
Secondary — a parts or tool maker, or a gunsmithing publisher

Remove the rear sight, fit the Leupold dovetail (part number up) in its place, set the mount base over it, seat the DeltaPoint Pro on the base posts, then torque the two Torx screws (press-fit).

“Secure the screws by applying 25 in-lbs of torque.”

 Leupold DeltaPoint Pro Reflex Sight — Operating Instructions (Part #120278, artwork #120279P; English text with French translation) — Leupold & Stevens, Inc., PDF p. 1 (Installation section; mount li leupold.com [17]

Materials and factory finish

As stated by Glock Ges.m.b.H.. Prep, masking and cure depend on these; a polymer or aluminium part, a nitrided or anodised finish, and a blued steel part are each a different job. Variants with other finishes may exist — check the maker's page for the exact SKU on the bench.

ComponentMaterialFactory finishWhere it comes from
Frame
G17 Gen5		polymer—GLOCK Owner's Manual — Models G17 to G48 (Instructions for Use) — GLOCK Ges.m.b.H. eu-assets.contentstack.com [1]
“FRAME: The frame (17) is made of polymer with hardened steel guides.”
Slide
G17 Gen5		—matte blackGLOCK Owner's Manual — Models G17 to G48 (Instructions for Use) — GLOCK Ges.m.b.H. eu-assets.contentstack.com [1]
“SLIDE: The advanced surface treatment of the slide (1) results in optimal hardness by considerably reducing wear and tear and it makes it corrosion resistant, even when operating in saltwater conditions. The matte black surface minimizes light reflection – an advantage in tactical circumstances.”
Sights
standard front sights (steel sights optional)		polymer—GLOCK Owner's Manual — Models G17 to G48 (Instructions for Use) — GLOCK Ges.m.b.H. eu-assets.contentstack.com [1]
“All GLOCK pistol models come standard with polymer front sights (16a), which provide excellent damping characteristics on impact. Steel front sights with a white contrast point, steel luminescent sights and steel night sights with a self-illuminating tritium contrast point are available as options.”

Parts list

Transcribed from the manufacturer's parts list (GLOCK Owner's Manual — Models G17 to G48 (Instructions for Use) — GLOCK Ges.m.b.H., p. 48 eu-assets.contentstack.com [1]) — GLOCK's parts list on p. 48 of its Instructions for Use (G17–G48), paired with the exploded drawing of the GLOCK 17 Gen5 on p. 49. GLOCK prints items 25 and 30 as "---" on this list; they are left out.. Key numbers refer to the exploded view in that document.

35 parts
KeyPartPart no.QtyGroup
1Slide1
2Barrel1
3Recoil spring assembly
The recoil spring assembly is designed to be used as a one-piece unit for easier handling and must not be disassembled. Prior to 1991, GLOCK pistols were supplied with a separate recoil spring and recoil spring tube.		1
4Firing pin1
5Spacer sleeve1
6Firing pin spring1
7Spring cups1
8Firing pin safety1
9Firing pin safety spring1
10Extractor1
11Extractor depressor plunger1
12Extractor depressor plunger spring1
13Spring-loaded bearing1
14Slide cover plate1
15Rear sight1
16aFront sight1
16bFront sight screw1
17Frame1
17c/dBeavertail backstrap M/L1
18Magazine catch spring1
19Magazine catch1
20Slide lock spring1
21Slide lock1
22Locking block1
23Trigger mechanism housing with ejector1
24Connector1
26Trigger with trigger bar1
27Ambidextrous slide stop lever1
28Trigger pin1
29Trigger housing pin (short)1
31Magazine tube1
32Follower1
33Magazine spring1
34Magazine insert1
35Magazine floor plate1

Function check

After every reassemblyPerform these checks on a verified-unloaded firearm. If any check fails, the firearm is not safe to fire — stop and see a licensed gunsmith.

Maintenance

Lubrication points

Cleaning notes

Glock recommends a very light application of lubricant — roughly a single drop at each point. Over-lubrication attracts carbon and does more harm than good. Do not lubricate the striker channel; it should be run dry and clean.

Suggested inspection interval: roughly every 5000 rounds. This is a general guideline, not a manufacturer specification.

Wear parts to inspect

Recoil spring assembly · Extractor · Slide lock spring · Magazine springs and followers · Trigger spring

Common issues

SymptomLikely causeWhat to do
Slide will not come off after pulling the slide lock downSlide retracted too far, or the trigger was not pressed after the last rackLet the slide return to battery, verify the chamber is empty, press the trigger, then retract only about 1/8 in and try again.
Recoil spring assembly keeps falling out during reassemblyThe assembly is resting on the barrel rather than seated in the half-moon cut of the barrel lugReseat it into the cut on the underside of the barrel lug before pressing it down into the slide channel.
Brass to the face or erratic ejectionWorn extractor, worn ejector, weak recoil spring, or an out-of-spec extractor depressor plungerReplace the recoil spring assembly first as the cheapest variable, then inspect the extractor and ejector. see a gunsmith
Trigger does not resetTrigger bar not reengaging the striker lug, often from a reassembly error or debris in the frameStop using the pistol. Detail strip, clean, and inspect the trigger bar and connector. see a gunsmith

Also covers

The procedures above are reported to apply to: Glock 19 Gen5 · Glock 26 Gen5 · Glock 34 Gen5 · Glock 45 · Glock 47 · Most Gen3 and Gen4 Glock pistols (the field strip is identical; internal parts differ). Verify against the manual for your specific model.

Similar manual of arms

Legal notes

Not legal adviceDetail strip is owner-serviceable. Modifying or replacing the connector, striker, or firing pin safety changes trigger characteristics and, done wrong, can create an unsafe pistol. Some jurisdictions regulate magazine capacity.

Sourcing

Confidence
high — Cross-checked against a primary source such as the manufacturer's manual or an issuing military technical manual.
Verification
Checked against the manufacturer manual
Last updated
2026-10-29

References

Every source this page draws on, with its web address so you can read it yourself. Numbers in brackets elsewhere on the page point here.

Notes: Verified against the factory manual on 2026-09-14. The procedure as previously written was confirmed correct, including the 1/8 in (3 mm) slide retraction. Detail added from the manual: the reason over-retracting fails is that it resets the trigger forward; the barrel comes out by pushing it toward the front of the slide and then up and rearward; the recoil spring assembly seats in the second semi-circular notch on the barrel locking cams; and safety glasses are required. Field strip and reassembly are unchanged across Glock generations. Gen5 differs internally (Marksman barrel, ambidextrous slide stop, no locking block pin) but the owner-level procedure is the same.

Found something wrong? Corrections are the most valuable contribution to this project. Open an issue with the model, the step, and a source.