CZ 457

easy
Shop tier 1
high confidence
Rimfire Rifle
bolt action
rimfire
precision
interchangeable barrel

field strip ~2 min · reassembly ~3 min · detail strip ~30 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.

What Česká zbrojovka (CZ) says about disassembly CZ publishes bolt removal as the owner's strip and says not to go further: adjustment or repair goes to a competent gunsmith, and after heavy use CZ advises having a gunsmith clean the bolt. (CZ 457 Instruction Manual — Česká zbrojovka a.s. Uherský Brod, p. 9 czubstrapiwebsitestorage.blob.core.windows.net [1])

Specifications

Manufacturer: Česká zbrojovka (CZ)
Origin: Czech Republic
Category: Rimfire Rifle
Action: Bolt action
Calibers: .22 Long Rifle, .22 WMR, .17 HMR
Capacity: 5 or 10 rounds in the detachable magazine
Production: 2019–present (in-production)
Also known as: CZ 457 Lux, CZ 457 American, CZ 455 (predecessor)

Model-specific safety

Removing the magazine does not clear the chamber. Cycle the bolt and check the chamber directly.
The bolt release must be operated to withdraw the bolt. Do not force the bolt out — if it will not come, the release is not engaged or the safety is blocking it.
Clean from the breech with a bore guide. Cleaning a bolt rifle from the muzzle without a guide wears the crown and costs accuracy permanently.
Removing the barrelled action from the stock changes the bedding relationship. Reinstall the action screws to a consistent torque or the rifle will shift its zero.
This is a rimfire. A .22 LR round in the chamber is small and dull-coloured — use a light and a finger.
Do not dry fire a rimfire. The firing pin can peen the chamber mouth.
The 457 uses an interchangeable barrel system retained by set screws in the receiver. Changing barrels affects headspace and should be done following the manufacturer’s procedure exactly.

Under spring tension

Firing pin spring inside the bolt (detail strip)
Magazine follower spring

Easily lost parts

Bolt release · Action screws · Magazine or floorplate components

Tools

Tool	Required	Used for	Substitute
Bore guide	Yes	Cleaning from the breech without damaging the throat or the crown.	There is no good substitute. A rod run into an unguided chamber scrapes the throat.
Hex key or screwdriver matching the action screws	Optional	Removing the barrelled action from the stock. Not needed for routine cleaning.
Torque wrench	Optional	Reinstalling action screws to a consistent value, which is an accuracy variable on every bolt rifle.

Shop difficulty

Shop tier 1 Tier 1 — easy among rimfire rifles, for the full job: strip to the parts that get coated and put it back together working. Bolt-action: the barrelled action comes out of the stock on two screws, the bolt comes out on its catch, and the trigger mechanism is an adjustable unit that a shop removes whole rather than strips. The long list (96 rows, 109 pieces) covers many variant and stock parts; the only care points are the striker spring in the bolt and action-screw torque.

Parts: 96 numbered parts (Single CZ 457 list covering all 457 variants (rows marked * vary by model), incl. spare-parts assemblies; 96 rows), from CZ 457 Instruction Manual — Česká zbrojovka a.s. Uherský Brod, p. 12 czubstrapiwebsitestorage.blob.core.windows.net [1].

Bench time: about 25 min to strip, 35 min to rebuild (estimate). Action out of the stock on two screws, bolt stripped (striker, extractors), trigger unit off as a whole, sights; rebuild mostly the bolt and action-screw torque.

Small parts: 8 pins, 10 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

Stock: stock fixing screws (pos. 73, 74), barrelled action out of the stock
Action: bolt (bolt catch), trigger mechanism as a unit, magazine catch, sights / scope base
Bolt: cocking piece and striker with spring, extractors

Special tools

Torque driver (3.5 Nm) — Stock fixing screws
Sight pusher — Dovetail sights, if fitted

Known pain points

CZ says not to strip the rifle past bolt removal and to hand the bolt to a gunsmith for cleaning; the trigger mechanism is adjustable and should be left as a unit. (both)
Source: CZ 457 Instruction Manual — Česká zbrojovka a.s. Uherský Brod czubstrapiwebsitestorage.blob.core.windows.net [1] — “Do not strip your firearm any further. If you assume that your firearm requires adjustment or repair, entrust this work to a competent gunsmith in a specialized workshop!”
Stock screws must go back to a set torque. (reassembly)
Source: CZ 457 Instruction Manual — Česká zbrojovka a.s. Uherský Brod czubstrapiwebsitestorage.blob.core.windows.net [1] — “Check tightening of the stock fixing screws (pos. 73 and 74) and tighten them as necessary with the torque of 3.5 Nm.”

Fit or check on rebuild

Stock screw torque 3.5 Nm — Inconsistent action-screw torque shifts zero.
Source: CZ 457 Instruction Manual — Česká zbrojovka a.s. Uherský Brod czubstrapiwebsitestorage.blob.core.windows.net [1] — “tighten them as necessary with the torque of 3.5 Nm.”
Trigger pull and travel check — The trigger is adjustable; confirm it is unchanged after the unit comes off.
Re-zero — Sights or scope base removed.

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

Manufacturer videos

Official videos from Česká zbrojovka (CZ)'s own channels, linked rather than copied. Where a video and the steps on this page differ, follow the manufacturer's manual and video.

How to Change the Stock on a CZ 457 CZ Firearms adjustment, field strip · 2026-09-15
Covers: CZ 457
How to Change the Barrel and Caliber on a CZ 457 CZ Firearms adjustment, detail strip, detail reassembly · 2026-09-15
Covers: CZ 457
How to Adjust the Trigger on a CZ 457 CZ Firearms adjustment · 2026-09-15
Covers: CZ 457
How to Disassemble the CZ 457 Magazine CZ Firearms detail strip, maintenance · 2026-09-15
Covers: CZ 457 magazine

Procedures

Clear and Make Safe

Clear & Make Safe

Point the muzzle in a safe direction and keep your finger off the trigger.
Place the safety in the on position.
Lift the bolt handle and draw the bolt fully rearward, extracting and ejecting any chambered round.
Remove the detachable magazine.
Removed at this step: Magazine contents
Inspect the chamber and magazine well with a light and physically confirm the chamber is empty.
WarningLook and feel. Both, every time.
Remove all live ammunition from the work area.

Field Strip

Bolt removal is the whole of routine maintenance on a bolt rifle. The bore cleans from the breech with the bolt out.

Manufacturer’s video: How to Change the Stock on a CZ 457 CZ Firearms

Complete the Clear and Make Safe procedure and remove the magazine.
Shift the safety to its Off position. The bolt will not come out with the safety engaged.
WarningThe safety is off from here on. Muzzle discipline matters more than ever.
Open the bolt, depress the bolt catch, and pull the bolt out of the rifle.
Removed at this step: Bolt
Clean the bore from the breech using a bore guide, and clean the bolt face, lugs, and chamber.
Stop here for routine maintenance. The manual directs bolt cleaning to a competent gunsmith after a great number of rounds.
While the rifle is apart, check that the two stock fixing screws are tight; the manual specifies 3.5 Nm.
TipTorque, not feel. Over-tightening a rimfire action into its stock will shift point of impact.

Reassembly

Confirm the bolt is correctly assembled and the bolt head is properly oriented.
Align the bolt with the receiver raceway and slide it forward into the action.
Close the bolt handle and cycle the bolt several times to confirm smooth travel and correct cocking.
Confirm the bolt release retains the bolt when the action is opened fully.
Perform the function check.

Remove the Barrelled Action from the Stock

Detail Strip tools required

For a deep clean or bedding work. Not routine maintenance.

Manufacturer’s videos: How to Change the Barrel and Caliber on a CZ 457 CZ Firearms · How to Disassemble the CZ 457 Magazine CZ Firearms

Verify the rifle is unloaded and remove the bolt and magazine.
Remove the action screws from the bottom of the stock, noting which screw came from which hole.
TipThey are often different lengths.
Removed at this step: Action screws Floorplate or magazine assembly
Lift the barrelled action out of the stock.
Removed at this step: Stock
To reinstall, seat the action in the stock, start both screws by hand, then tighten the front screw first and the rear second to a consistent torque.
WarningInconsistent action screw torque is one of the most common causes of a rifle that will not hold zero. Consult your stock maker’s specification rather than guessing.

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.

Fastener	Torque	Sequence, notes and the source's words	Where it comes from
Stock fixing screws (key nos. 73 and 74)	3.5 N·m 31 in-lb · 2.6 ft-lb	“Check tightening of the stock fixing screws (pos. 73 and 74) and tighten them as necessary with the torque of 3.5 Nm.”	CZ 457 Instruction Manual — Česká zbrojovka a.s. Uherský Brod, p. 9 czubstrapiwebsitestorage.blob.core.windows.net [1]

Reported by other sources — not the manufacturer

Not a manufacturer specificationThese values come from the people and publications named beside each one, not from Česká zbrojovka (CZ), 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.

Fastener	Torque	Who says so, and their words	Where it comes from
Action screws (both) CZ 457 in a KRG Bravo Chassis (Gen 2)	45 in-lb 5.1 N·m · 3.7 ft-lb	Reported by Kinetic Research Group (KRG) Secondary — a parts or tool maker, or a gunsmithing publisher “***for CZ-457 ONLY apply 45 in-lbs of torque to each action screw.”	KRG Bravo Chassis (Gen 2) Installation Instructions (INST-BRV) — Kinetic Research Group (KRG), PDF p. 2 kineticresearchgroup.com [2]
Action screws (front and rear) CZ 457 in an MDT Oryx chassis	15–45 in-lb 1.7–5.1 N·m · 1.2–3.7 ft-lb	Reported by MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) Secondary — a parts or tool maker, or a gunsmithing publisher Push the action rearward against the recoil lug and torque the front action screw first, then the rear (manual p. 1: 'first torquing the front then the rear action screw'). “CZ457 — 5mm Hex Wrench — 15-45 inch-pounds”	MDT Oryx Chassis System — User Manual (13694, Version 07.14.26), attached to MDT help-centre article 'ORYX Chassis Installation Guides' — MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT), PDF p. 2 (inlet-specific torque table) support.mdttac.com [4]
Action screws (front and rear) CZ 457 in an MDT Field Stock (same row in the MDT XRS chassis manual)	20–45 in-lb 2.3–5.1 N·m · 1.7–3.7 ft-lb	Reported by MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) Secondary — a parts or tool maker, or a gunsmithing publisher Front then rear. “CZ457 — 4mm Hex Wrench — 20-45 inch-pounds”	MDT Field Stock — User Manual (13739, Version 03.3.26), attached to MDT help-centre article 'Field Stock Installation' (image-only PDF; read from the rendered page) — MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT), PDF p. 2 (inlet-specific torque table) support.mdttac.com [5]
Action screws (front and rear) CZ 457 in an MDT LSS Gen3 chassis (same row in the MDT ACC Premier Gen2 manual)	45 in-lb 5.1 N·m · 3.7 ft-lb	Reported by MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) Secondary — a parts or tool maker, or a gunsmithing publisher Front then rear. “CZ457 — 4mm Hex Wrench — 45 inch-pounds”	MDT LSS Gen3 Chassis — User Manual (13735, Version 07.07.26 / table page 06.04.26), attached to MDT help-centre article 'LSS GEN3 Chassis Installation' — MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT), PDF p. 2 (inlet-specific torque table) support.mdttac.com [6]
Action screws (front then back) CZ 457 in an MDT ACC Elite chassis	max. 45 in-lb 5.1 N·m · 3.7 ft-lb	Reported by MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) Secondary — a parts or tool maker, or a gunsmithing publisher Push the action back towards the buttstock; tighten front then back. 'Torque to preference while tuning, ensuring the final torque does not exceed 45 in-lbs.' “3. While pushing the action back towards the buttstock, insert the supplied action screws, using a 4MM Hex Drive, torque up to 45 inch-pounds, first tightening the front then back action screw.”	MDT ACC Elite Chassis System — User Manual (13733, Version 01.20.2026), attached to MDT help-centre article 'ACC Elite Chassis System Installation Guides/Manual' (image-only PDF; read from the rendered page) — MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT), PDF p. 3 ('CZ457 Installation', step 3) support.mdttac.com [7]
Scope base clamp screws (4) CZ 452 / CZ 455 / CZ 457 with the MDT CZ Rimfire Scope Base	15–20 in-lb 1.7–2.3 N·m · 1.2–1.7 ft-lb	Reported by MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) Secondary — a parts or tool maker, or a gunsmithing publisher Slide the rail forward until its recoil lug bears on the front of the ejection port, then torque; re-check after 100-150 rounds. “4. Torque all screws to 15-20 in-lb. After taking out your CZ for some fun (100-150 rounds), check all four screws and re-torque if necessary.”	MDT CZ Rimfire Scope Base (CZ 452, CZ 455, CZ 457) — Instructions V2.0 April 2022, attached to MDT help-centre article 'CZ 452/455/457 scope base installation' — MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT), PDF p. 3, step 4 support.mdttac.com [8]
Action screws (front then back) CZ 457 in an XLR chassis (supplied recoil lug placed in the lug pocket)	35 in-lb 4 N·m · 2.9 ft-lb	Reported by XLR Industries Secondary — a parts or tool maker, or a gunsmithing publisher Stand the rifle on the recoil pad to seat the lug, hand-tighten front then back, then torque front then back. “• For CZ-457 and Anschutz torque to 35 INCH-pounds.”	XLR Industries — Chassis & Buttstock Instructions (2022), linked from xlrindustries.com 'XLR Chassis System Instructions' (image-only PDF; read from the rendered page) — XLR Industries, PDF p. 3, step 8 cdn.shopify.com [9]

Materials and factory finish

As stated by Česká zbrojovka (CZ). 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.

Component	Material	Factory finish	Where it comes from
Stock CZ 457 American	walnut	varnished	CZ 457 American — CZ-USA cz-usa.com [3] “The varnished American-style stock is made from high quality walnut, with checkering on the grip that incorporates a fleur-de-lis motif.”

Parts list

Transcribed from the manufacturer's parts list (CZ 457 Instruction Manual — Česká zbrojovka a.s. Uherský Brod, p. 12 czubstrapiwebsitestorage.blob.core.windows.net [1]) — Single CZ 457 list (English section) covering all 457 variants; rows marked * vary by model or are absent in some. Includes the "Spare parts assemblies" sub-list (M, H1, H2, V, Z, S, L). ES/CS/DE/FR copies omitted.. Key numbers refer to the exploded view in that document.

96 parts

Key	Part	Qty
1	Barrel The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
2	Barrel Screw	2
3	Front Sight The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
4	Front Sight Cover The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
5	Front Sight Base The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
6	Front Sight Base Screw The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
7	Front Sight Setting Screw (A) The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
8	Front Sight Setting Screw (B) The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
9	Front Sight Pin The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
10	Rear Sight Base The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
11	Rear Sight Base Screw The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	2
12	Rear Sight Leaf The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
13	Rear Sight Leaf Spring The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
14	Rear Sight Plate The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
15	Rear Sight Screw The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	2
16	Slider	1
17	Rear Sight Button The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
18	Rear Sight Button Spring The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
19	Magazine Housing Insert The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
20	Magazine Housing Insert Pin The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
21	Receiver	1
22	Magazine Housing	1
23	Magazine Housing Front Screw	1
24	Magazine Housing Rear Screw	1
25	Magazine Catch	1
26	Magazine Catch Spring	1
27	Magazine Catch Pin	1
28	Bolt Catch	1
29	Bolt Catch Spring	1
30	Bolt Catch Pin	1
31	Bolt Guide	1
32	Bolt	1
33	Extractor	1
34	Holder	1
35	Extractor Spring	1
36	Striker	1
37	Bolt Handle	1
38	Bolt Handle Ball	1
39	Cocking Indicator	1
40	Cocking Indicator Spring	1
41	Striker Spring	1
42	Lock	1
43	Lock Pin	1
44	Trigger Mechanism Holder	1
45	Holder Screw	1
47	Trigger	1
48	Trigger Pin	1
49	Trigger Setting Screw (C)	1
50	Nylon Thread of Trigger Setting Screw	1
51	Trigger Dead-Travel Screw (B)	1
52	Nylon Thread of Trigger Dead Travel Screw	1
53	Trigger Pull Setting Screw (A)	1
54	Trigger Pull Setting Screw Spring	1
55	Trigger Pull Screw Nut	1
56	Safety	1
57	Safety Spring	1
58	Trigger Bar	1
59	Trigger Bar Spring	1
60	Safety Yoke Ring	1
61	Trigger Bar Pin	1
62	Safety Yoke Ring	3
63	Cam	1
64	Cam Washer	1
65	Cam Washer Screw	1
66	Cam Pin	1
67	Frame	1
68	Trigger Guard	1
69	Stock The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
70	Stock Insert The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
71	Butt Plate The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
72	Butt Plate Screw	2
73	Front Connecting Screw	1
74	Rear Connecting Screw	1
75	Trigatti Sling Swivel Holder The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	2
76	Safari Sling Swivel Holder The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	2
77	Magazine The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
78	Thread protection The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
79	Compensator The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
80	Buttplate base The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
81	Screw The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	5
82	Loop base The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
83	Cheekpiece Screw The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	2
84	Cheekplate thrust screw The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
85	Cheekplate thrust washer The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
86	Cheekplate thrust plate The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
87	Cheekpiece The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
88	Adjustable buttplate The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
89	Weaver rail The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
90	Ball rubber sleeve The parts marked * differ depending on the model of the rifle, or as the case may be in some versions are entirely missing.	1
Spare parts assemblies
M	Front Sight	1
H1	Rear sight with base	1
H2	Rear sight without base	1
V	Magazine Housing	1
Z	Bolt	1
S	Trigger mechanism	1
L	Cheekpiece	1

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.

Verify the rifle is unloaded and the magazine is empty before each check.
Cycle the bolt and confirm it cocks and closes fully into battery.
With the action cocked, engage the safety and press the trigger. The firing pin must not release.
Disengage the safety without touching the trigger. The firing pin must not release.
Press the trigger and confirm the firing pin releases cleanly.
Confirm the bolt release retains the bolt.
Load dummy rounds and confirm they feed from the magazine and eject cleanly.

Maintenance

Lubrication points

Bolt lugs and the locking recesses
Bolt body where it rides in the raceway
Cocking cam surfaces
Extractor

Cleaning notes

Clean from the breech with a bore guide. Do not over-lubricate the firing pin assembly — heavy oil there congeals in cold weather and causes light strikes. Keep the chamber dry and free of oil before shooting, since oil in a chamber raises bolt thrust.

Suggested inspection interval: roughly every 500 rounds. This is a general guideline, not a manufacturer specification.

Wear parts to inspect

Extractor · Ejector and spring · Bolt lugs · Firing pin spring · Crown (inspect for cleaning rod wear)

Common issues

Symptom	Likely cause	What to do
Group size opens up after cleaning or transport	Action screw torque changed	Retorque the action screws consistently, front first.
Light strikes in cold weather	Heavy or congealed oil in the firing pin assembly	Degrease the firing pin assembly and run it dry or with a light synthetic lubricant.
Bolt will not withdraw	Bolt release not operated, or the safety is blocking it	Move the safety to fire and operate the release. Do not force the bolt.

Also covers

The procedures above are reported to apply to: CZ 455 (similar interchangeable-barrel system) · CZ 457 Varmint, American, Lux, and At-One variants. Verify against the manual for your specific model.

Similar manual of arms

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.

[1] CZ 457 Instruction Manual — Česká zbrojovka a.s. Uherský Brod manufacturer manual primary source
https://czubstrapiwebsitestorage.blob.core.windows.net/strapi-global/assets/735342000443_CZ_457_05_2025_en_es_cs_de_fr_48cf870932.pdf (checked 2026-09-14)
[2] KRG Bravo Chassis (Gen 2) Installation Instructions (INST-BRV) — Kinetic Research Group (KRG) manufacturer manual secondary source
https://kineticresearchgroup.com/download/79805/ (checked 2026-09-27)
[3] CZ 457 American — CZ-USA website primary source
https://cz-usa.com/product/cz-457-american/ (checked 2026-10-03)
[4] MDT Oryx Chassis System — User Manual (13694, Version 07.14.26), attached to MDT help-centre article 'ORYX Chassis Installation Guides' — MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) manufacturer manual secondary source
https://support.mdttac.com/hc/article_attachments/51468856863892 (checked 2026-10-11)
[5] MDT Field Stock — User Manual (13739, Version 03.3.26), attached to MDT help-centre article 'Field Stock Installation' (image-only PDF; read from the rendered page) — MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) manufacturer manual secondary source
https://support.mdttac.com/hc/article_attachments/51745558131092 (checked 2026-10-11)
[6] MDT LSS Gen3 Chassis — User Manual (13735, Version 07.07.26 / table page 06.04.26), attached to MDT help-centre article 'LSS GEN3 Chassis Installation' — MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) manufacturer manual secondary source
https://support.mdttac.com/hc/article_attachments/51874557357204 (checked 2026-10-11)
[7] MDT ACC Elite Chassis System — User Manual (13733, Version 01.20.2026), attached to MDT help-centre article 'ACC Elite Chassis System Installation Guides/Manual' (image-only PDF; read from the rendered page) — MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) manufacturer manual secondary source
https://support.mdttac.com/hc/article_attachments/50441627587092 (checked 2026-10-11)
[8] MDT CZ Rimfire Scope Base (CZ 452, CZ 455, CZ 457) — Instructions V2.0 April 2022, attached to MDT help-centre article 'CZ 452/455/457 scope base installation' — MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) manufacturer manual secondary source
https://support.mdttac.com/hc/article_attachments/30236314345748 (checked 2026-10-11)
[9] XLR Industries — Chassis & Buttstock Instructions (2022), linked from xlrindustries.com 'XLR Chassis System Instructions' (image-only PDF; read from the rendered page) — XLR Industries manufacturer manual secondary source
https://cdn.shopify.com/s/files/1/0995/2330/files/ChassisButtstock-Instructions-2022.pdf?v=1657120420 (checked 2026-10-11)

Notes: Verified against the factory manual on 2026-09-14. Confirmed the safety-off requirement, and added the manual's 3.5 Nm figure for the stock fixing screws. The interchangeable barrel system is the distinctive feature and the one most likely to cause a problem if done casually. Follow the factory procedure for barrel changes and verify headspace.

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