← SIG Sauer P365 reference page · This work order as JSON ·
Work order — SIG Sauer P365
Taking the firearm apart for a job such as refinishing, and putting it back together to specification. Generated from the Pew-Takedown entry last updated 2026-10-29. Confidence: medium.
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Before you startEducational 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.
- SIG Sauer limits owner disassembly: Field strip, magazine disassembly, and the section 8 user procedures, including removing the Fire Control Unit from the grip module without disassembling it.
- This work order is written for the SIG Sauer P365. It is reported to cover P365 XL; P365 X-Macro; P365-380; P365 SAS — if the firearm on the bench is one of those, check the torque notes: values do not always carry over.
Shop difficulty: Tier 1 of 3
For coating, the FCU comes out of the grip module and stays assembled, and the slide has striker, extractor and sights, so the job is Glock-like. Inside the FCU, though, everything is miniaturised; owners call it a pain to reassemble and SIG does not authorise going past the field strip. 38 parts (pistol per the MCARBO 'SIG P365 Exploded View' (both grip frames), keys 1-38; the list includes BOTH the standard grip module (15) and the manual-safety grip module with its parts (22 grip module, 23 ). Pew-Takedown's rating, not the manufacturer's.
Bench time: strip ~15 min, rebuild ~25 min (estimate). Actual: strip ______ rebuild ______
Special tools:
- dovetail sight pusher (or brass drift and padded vise) — Removing and refitting dovetailed sights for coating
Watch for:
- After reassembly the takedown lever can stop half way and block the slide. (reassembly; SIGforum)
- SIG authorises nothing past the field strip. (both; SIG SAUER)
1. Clear and make safe
- Point the muzzle in a safe direction and keep your finger off the trigger.
- Press the magazine release and remove the magazine.
- Retract the slide fully and lock it open with the slide catch lever.
- Visually and physically verify the chamber is empty.
Tip: The short slide and small ejection port make a light worth using. - Remove all live ammunition from the work area.
2. Disassemble
Field Strip
- Complete the Clear and Make Safe procedure and leave the slide locked to the rear.
- Rotate the takedown lever on the left side of the frame downward until it stops.
- Hold the slide, release the slide catch, and ease the slide forward off the frame.
- Lift the recoil spring assembly out of the inverted slide.
Warning: The spring is short and stiff. Keep a thumb on it. - Lift the barrel up and out of the slide.
3. Refinish
The components the procedures above separate. Coating, masking and cure are outside this database; follow your coating system's instructions. A part the manufacturer marks "factory fit" should not be swapped or reworked.
| Component separated | Out | Coated | Back in |
|---|---|---|---|
| Slide assembly | |||
| Recoil spring assembly | |||
| Barrel |
| Component | Material | Factory finish | Source |
|---|---|---|---|
| Grip module all P365 models (manual 14.0) | Glass reinforced | — | [2] |
| Slide all P365 models (manual 14.0) | stainless steel | — | [2] |
| Slide P365 NITRON MICRO-COMPACT (and P365 Manual Safety) | Stainless Steel | NITRON® | [5] |
4. Reassemble
Reassembly
- Set the barrel into the inverted slide and seat it fully forward.
- Seat the recoil spring assembly into the barrel lug cut and press it down into the slide channel.
- Set the slide onto the frame rails and push it rearward until the slide catch can lock it open.
- With the slide locked back, rotate the takedown lever up to horizontal.
- Release the slide and perform the function check.
5. Torque
| Fastener | Specification | Sequence | Source | Applied | Init. |
|---|---|---|---|---|---|
| Sight plate screws (2, rear sight, 5/64 in. hex, from bottom of slide) SIG P365 pistols |
8 in-lb 0.9 N·m · 0.67 ft-lb |
Note: 'Sight plate screws are for securing the rear sight and sight plate only.' 8.1 table: Sight Plate Screws 8 in-lbf / 1.02 nm, LOCTITE 243. Threadlocker: LOCTITE 243 (8.1 table) if no Nylok patch |
[2] p. 84 | ||
| Optic filler plate screws (2, T10, top of slide) SIG P365 optic-cut (optics-ready) slides |
8 in-lb 0.9 N·m · 0.67 ft-lb |
Place plate into its slot in slide; align screw holes; torque to 8 in-lbf. Note: 'Optic filler plate screws are for securing the optic filler plate only.' 8.1 table: Optic Filler Plate Screws 8 in-lbf / 1.02 nm. Threadlocker: LOCTITE 243 (8.1 table) if no Nylok patch |
[2] p. 86 | ||
| RomeoZero mounting screws (2, 2 mm hex) SIG P365 pistols fitted with the SIG RomeoZero optic |
9 in-lb 1 N·m · 0.75 ft-lb |
Insert battery into bottom of RomeoZero (+ toward slide), insert into shroud (if equipped); align holes of RomeoZero, shroud, chemical shield and slide; install screws and torque to 9 in-lbf; refer to RomeoZero manual to zero. Threadlocker: LOCTITE 243 (8.1 table) if no Nylok patch |
[2] p. 89 | ||
| ROMEO-X optic mount screws, M3x0.5-11.75mm, into P365 optic-ready slide SIG ROMEO-X (Compact) mounted directly on a SIG P365 optic-ready slide |
24 in-lb 2.7 N·m · 2 ft-lb |
Remove any pistol optic cover plate. Ensure threaded mounting holes are clean and free of debris or thread locker compound. Test the screws thread smoothly. Set the ROMEO-X on the mounting surface, lining up recoil bosses with the witness holes. Thread the screws in while putting forward pressure (toward the muzzle) on the optic housing, then torque. | [3] PDF p. 12 (PDF p. 12) |
Reported by other sources — not the manufacturer
Not a manufacturer specificationConfirm with the manufacturer or a licensed gunsmith before use. Where these differ from a manufacturer value above, the manufacturer wins.
| Fastener | Reported value | Sequence | Source | Applied | Init. |
|---|---|---|---|---|---|
| Optic plate to slide screws (M3 x 0.5 x 12 mm) SIG P365 Macro / P365X (Oct 2022+, rear sight in own dovetail) with Forward Controls Design OPF-P365 Macro, RMRcc plate; not SIG-LOC footprint Reported by Forward Controls Design (secondary) — not the manufacturer |
15 in-lb 1.7 N·m · 1.2 ft-lb |
[4] | |||
| Optic (sight) to plate screws, Trijicon RMRcc (5-40 x 3/8) SIG P365 Macro / P365X with FCD OPF-P365 Macro, RMRcc plate, Trijicon RMRcc Reported by Forward Controls Design (secondary) — not the manufacturer |
15–18 in-lb 1.7–2 N·m · 1.2–1.5 ft-lb |
[4] | |||
| Red-dot optic mounting screws on EGW adapter (replaces optics-ready rear sight plate) SIG Sauer P365X / P365XL Optics Ready (rear sight in cover plate) and P365 Optics Ready with fixed rear sight, with the EGW 'Trijicon RMR/SRO & Holosun 407c/507c Mount for Sig P365/X/XL Optics Ready P Reported by Evolution Gun Works (EGW) (secondary) — not the manufacturer |
15 in-lb 1.7 N·m · 1.2 ft-lb |
Remove the rear sight plate, install the EGW mount on the slide, place the optic, apply blue Loctite, torque the mounting screws. Threadlocker: Blue Loctite on the provided mounting screws (EGW instructions) |
[6] | ||
| Adapter plate and optic screws (EGW plate replacing the optics cover plate) SIG Sauer P365X / P365XL Optics Ready with the EGW 'Sig P365 Optics Ready Red Dot Plate | EGW Fits Venom & FastFire' (not P365 SAS, XMACRO, P322) Reported by Evolution Gun Works (EGW) (secondary) — not the manufacturer |
15 in-lb 1.7 N·m · 1.2 ft-lb |
Remove factory optics cover plate, install EGW adapter plate, install optic, apply blue Loctite, torque screws. Threadlocker: Blue Loctite (EGW) |
[7] |
Fit or check on rebuild
- Takedown lever rotates fully down — A lever that stops half way after rebuild means the FCU or slide catch is mis-set
- Function check: trigger reset, sear/striker engagement, safeties — Standard post-reassembly check on any pistol whose fire-control parts were removed; a mis-seated spring shows up here, not on the bench
6. Function check
- Verify the pistol is unloaded with no magazine inserted before each check.
- Rack the slide and press the trigger. The striker should release cleanly.
- Hold the trigger back, rack the slide, release slowly and confirm the reset.
- Press the trigger again to confirm the striker releases.
- If the pistol has a manual safety, confirm it blocks the trigger.
- Confirm the slide locks open on an empty magazine and the magazine drops free.
- Cycle several dummy rounds by hand to confirm feeding before carrying the pistol.
If any check fails, the firearm is not safe to fire. Stop and see a licensed gunsmith.
Sources
- SIG Sauer P365 Operator's Manual — SIG Sauer, Inc. primary
- SIG P365 Operator's Manual: Handling & Safety Instructions, 2700116-01 REV07, section 8 — SIG SAUER primary
https://www.sigsauer.com/media/sigsauer/resources/OPERATORS_MANUAL_P365_2700116-01_REV07_LR.pdf - ROMEO-X COMPACT and PRO Open Reflex Sights Operator's Manual, 7403919-01 REV02 — SIG SAUER primary
https://www.sigsauer.com/media/sigsauer/resources/OPERATORS_MANUAL_ROMEO-X_PRO_7403919-01_REV02_WEB_FILE.pdf - OPF-P365 Macro, RMRcc (no rear sight dovetail) (product page) — Forward Controls Design secondary
https://www.forwardcontrolsdesign.com/OPF-P365-Macro-RMRcc-no-rear-sight-dovetail_p_544.html - SIG SAUER, Inc. — 2019 GDS CATLOG WORKING FINAL LR — SIG SAUER, Inc. primary
https://www.sigsauer.com/pub/media/sigsauer/resources/2019_GDS_CATLOG_WORKING-FINAL-LR.pdf - Trijicon RMR/SRO & Holosun 407c/507c Mount for Sig P365/X/XL Optics Ready Pistols (EGW product page, installation instructions section) — Evolution Gun Works (EGW) secondary
https://egwguns.com/trijicon-rmr-sro-holosun-407c-507c-sight-mount-adapter-for-sig-p365-optics-ready - Sig P365 Optics Ready Red Dot Plate | EGW Fits Venom & FastFire (EGW product page, installation instructions section) — Evolution Gun Works (EGW) secondary
https://egwguns.com/vortex-viper-venom-sig-sauer-p365-optics-ready-sight-mount-adapter-fits-burris-fastfire-and-docter - P365 reassembly problem - Topic — SIGforum anecdotal
https://sigforum.com/eve/forums/a/tpc/f/150601935/m/9440096905?r=6060096905 - SIG P365 Exploded View (both grip frames), linked from the MCARBO Sig P365 Trigger Spring Kit page — MCARBO secondary
https://mcarbo.americommerce.com/.Exploded%20View/sig-p365-exploded-view-both-grip-frames.pdf
| Reassembled and function-checked by | Date |
|---|
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. Full disclaimer: https://github.com/Fundamental-build-LLC/Pew-Takedown
Legal notice: this material is third-party information compiled from sources of varying reliability and is provided for general informational and educational purposes only. It is not gunsmithing, technical, safety or legal advice, it is not verified or endorsed by any manufacturer, and it must not be taken as fact. Any work on a firearm beyond the routine field stripping described in its own owner's manual should be performed only by a licensed and insured gunsmith. You use this material entirely at your own risk. Fundamental Build LLC and the project's contributors make no warranty of any kind and accept no liability for death, injury, damage or loss arising from its use. Full terms: LEGAL.md.