← CZ 457 reference page · This work order as JSON ·
Work order — CZ 457
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: high.
| Work order # | |
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| Customer | |
| Model on the bench | |
| Serial number | |
| Finish / colour | |
| Received | |
| Technician |
- This work order is written for the CZ 457. It is reported to cover CZ 455 (similar interchangeable-barrel system); CZ 457 Varmint, American, Lux, and At-One variants — 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
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. 96 parts (Single CZ 457 list covering all 457 variants (rows marked * vary by model), incl. spare-parts assemblies; 96 rows). Pew-Takedown's rating, not the manufacturer's.
Bench time: strip ~25 min, rebuild ~35 min (estimate). Actual: strip ______ rebuild ______
Special tools:
- Torque driver (3.5 Nm) — Stock fixing screws
- Sight pusher — Dovetail sights, if fitted
Watch for:
- 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; Česká zbrojovka a.s. Uherský Brod)
- Stock screws must go back to a set torque. (reassembly; Česká zbrojovka a.s. Uherský Brod)
Tools
- Bore guide — Cleaning from the breech without damaging the throat or the crown.
- Hex key or screwdriver matching the action screws — Removing the barrelled action from the stock. Not needed for routine cleaning.
- Torque wrench — Reinstalling action screws to a consistent value, which is an accuracy variable on every bolt rifle.
1. Clear and 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.
- Inspect the chamber and magazine well with a light and physically confirm the chamber is empty.
Warning: Look and feel. Both, every time. - Remove all live ammunition from the work area.
2. Disassemble
Manufacturer's video: How to Change the Stock on a CZ 457 (CZ Firearms)
https://www.youtube.com/watch?v=5S0M1MEWNYI
How to Change the Barrel and Caliber on a CZ 457 (CZ Firearms)
https://www.youtube.com/watch?v=mnSKzzLABuU
How to Disassemble the CZ 457 Magazine (CZ Firearms)
https://www.youtube.com/watch?v=nOVwABWuPa8
Field Strip
- 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.
Warning: The 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.
- Clean the bore from the breech using a bore guide, and clean the bolt face, lugs, and chamber.
- While the rifle is apart, check that the two stock fixing screws are tight; the manual specifies 3.5 Nm.
Tip: Torque, not feel. Over-tightening a rimfire action into its stock will shift point of impact.
Remove the Barrelled Action from the Stock
- 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.
Tip: They are often different lengths. - Lift the barrelled action out of the stock.
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 |
|---|---|---|---|
| Bolt | |||
| Action screws | |||
| Floorplate or magazine assembly | |||
| Stock |
| Component | Material | Factory finish | Source |
|---|---|---|---|
| Stock CZ 457 American | walnut | varnished | [3] |
The manufacturer's full parts list (96 parts) is on the reference page.
4. Reassemble
Manufacturer's video: How to Change the Barrel and Caliber on a CZ 457 (CZ Firearms)
https://www.youtube.com/watch?v=mnSKzzLABuU
Remove the Barrelled Action from the 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.
Warning: Inconsistent 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.
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.
5. Torque
| Fastener | Specification | Sequence | Source | Applied | Init. |
|---|---|---|---|---|---|
| Stock fixing screws (key nos. 73 and 74) | 3.5 N·m 31 in-lb · 2.6 ft-lb |
[1] p. 9 (PDF p. 10) |
Reported by other sources — not the manufacturer
| Fastener | Reported value | Sequence | Source | Applied | Init. |
|---|---|---|---|---|---|
| Action screws (both) CZ 457 in a KRG Bravo Chassis (Gen 2) Reported by Kinetic Research Group (KRG) (secondary) — not the manufacturer |
45 in-lb 5.1 N·m · 3.7 ft-lb |
[2] PDF p. 2 (PDF p. 2) | |||
| Action screws (front and rear) CZ 457 in an MDT Oryx chassis Reported by MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) (secondary) — not the manufacturer |
15–45 in-lb 1.7–5.1 N·m · 1.2–3.7 ft-lb |
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'). | [4] PDF p. 2 (inlet-specific torque table) (PDF p. 2) | ||
| Action screws (front and rear) CZ 457 in an MDT Field Stock (same row in the MDT XRS chassis manual) Reported by MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) (secondary) — not the manufacturer |
20–45 in-lb 2.3–5.1 N·m · 1.7–3.7 ft-lb |
Front then rear. | [5] PDF p. 2 (inlet-specific torque table) (PDF p. 2) | ||
| Action screws (front and rear) CZ 457 in an MDT LSS Gen3 chassis (same row in the MDT ACC Premier Gen2 manual) Reported by MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) (secondary) — not the manufacturer |
45 in-lb 5.1 N·m · 3.7 ft-lb |
Front then rear. | [6] PDF p. 2 (inlet-specific torque table) (PDF p. 2) | ||
| Action screws (front then back) CZ 457 in an MDT ACC Elite chassis Reported by MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) (secondary) — not the manufacturer |
max. 45 in-lb 5.1 N·m · 3.7 ft-lb |
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.' | [7] PDF p. 3 ('CZ457 Installation', step 3) (PDF p. 3) | ||
| Scope base clamp screws (4) CZ 452 / CZ 455 / CZ 457 with the MDT CZ Rimfire Scope Base Reported by MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) (secondary) — not the manufacturer |
15–20 in-lb 1.7–2.3 N·m · 1.2–1.7 ft-lb |
Slide the rail forward until its recoil lug bears on the front of the ejection port, then torque; re-check after 100-150 rounds. | [8] PDF p. 3, step 4 (PDF p. 3) | ||
| Action screws (front then back) CZ 457 in an XLR chassis (supplied recoil lug placed in the lug pocket) Reported by XLR Industries (secondary) — not the manufacturer |
35 in-lb 4 N·m · 2.9 ft-lb |
Stand the rifle on the recoil pad to seat the lug, hand-tighten front then back, then torque front then back. | [9] PDF p. 3, step 8 (PDF p. 3) |
Fit or check on rebuild
- Stock screw torque 3.5 Nm — Inconsistent action-screw torque shifts zero.
- 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.
6. Function check
- 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.
If any check fails, the firearm is not safe to fire. Stop and see a licensed gunsmith.
Sources
- CZ 457 Instruction Manual — Česká zbrojovka a.s. Uherský Brod primary
https://czubstrapiwebsitestorage.blob.core.windows.net/strapi-global/assets/735342000443_CZ_457_05_2025_en_es_cs_de_fr_48cf870932.pdf - KRG Bravo Chassis (Gen 2) Installation Instructions (INST-BRV) — Kinetic Research Group (KRG) secondary
https://kineticresearchgroup.com/download/79805/ - CZ 457 American — CZ-USA primary
https://cz-usa.com/product/cz-457-american/ - 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) secondary
https://support.mdttac.com/hc/article_attachments/51468856863892 - 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) secondary
https://support.mdttac.com/hc/article_attachments/51745558131092 - 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) secondary
https://support.mdttac.com/hc/article_attachments/51874557357204 - 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) secondary
https://support.mdttac.com/hc/article_attachments/50441627587092 - 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) secondary
https://support.mdttac.com/hc/article_attachments/30236314345748 - XLR Industries — Chassis & Buttstock Instructions (2022), linked from xlrindustries.com 'XLR Chassis System Instructions' (image-only PDF; read from the rendered page) — XLR Industries secondary
https://cdn.shopify.com/s/files/1/0995/2330/files/ChassisButtstock-Instructions-2022.pdf?v=1657120420
| 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.