← Mossberg Patriot reference page · This work order as JSON ·
Work order — Mossberg Patriot
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.
| Work order # | |
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| Customer | |
| Model on the bench | |
| Serial number | |
| Finish / colour | |
| Received | |
| Technician |
- O.F. Mossberg & Sons limits owner disassembly: Bolt removal from the receiver, and removal of the barreled action from the stock; nothing further.
- No manufacturer torque values are recorded. The values listed are reported by other sources, not the manufacturer — confirm them before use.
Shop difficulty: Tier 1 of 3
48 parts in Mossberg's own list. The rifle comes out of the stock with two action screws, and nothing is timed or held under tension. Mossberg reserves bolt and trigger disassembly beyond that for gunsmiths, so a full strip of the LBA trigger and bolt is the only unknown. 48 parts (Complete rifle, removable-magazine models (48 line items, quantity 1 each; no part numbers)). Pew-Takedown's rating, not the manufacturer's.
Bench time: strip ~30 min, rebuild ~45 min (estimate). Actual: strip ______ rebuild ______
Special tools:
- torque driver — Action screws
- bolt disassembly tool / vise — Compressing the firing-pin spring
Watch for:
- Mossberg stops the owner at bolt-out and action-out-of-stock. Everything further, including bolt and trigger internals, is gunsmith-only, so no factory detail-strip procedure exists. (both; O.F. Mossberg & Sons, Inc.)
- Several parts on the list are restricted to gunsmiths or the factory, so a lost or damaged spring cannot simply be reordered. (both; O.F. Mossberg & Sons, Inc.)
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
Field Strip
- Complete the Clear and Make Safe procedure.
- Check your rifle's own manual for whether the bolt releases with the safety on or off before you move it.
Warning: The rifle is unloaded at this point. Keep the muzzle in a safe direction regardless.
Tip: Makers genuinely disagree here. Of the bolt rifles checked against factory manuals so far, Winchester wants the safety in its middle detent, Browning and Ruger want it fully ON, and Savage and CZ want it OFF. Guessing is how people end up forcing a bolt that is simply locked. - Lift the bolt handle and draw the bolt fully rearward.
- Press the bolt release at the rear of the receiver and withdraw the bolt rearward.
- Clean the bore from the breech using a bore guide, and clean the bolt face, lugs, and chamber.
Warning: Always use a bore guide.
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 assembly | |||
| Action screws | |||
| Floorplate or magazine assembly | |||
| Stock |
No manufacturer statement of materials or finish is recorded. Identify each part's material before choosing prep and cure.
The manufacturer's full parts list (48 parts) is on the reference page.
4. Reassemble
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
No manufacturer torque values are recorded for this firearm.
Reported by other sources — not the manufacturer
| Fastener | Reported value | Sequence | Source | Applied | Init. |
|---|---|---|---|---|---|
| Action screws (2) Mossberg Patriot in a Boyds stock with the AICS-magazine kit Reported by Boyds Gunstocks (secondary) — not the manufacturer |
45 in-lb 5.1 N·m · 3.7 ft-lb |
Secure the front of the trigger guard with the factory 1/4"-28 x 1 1/2" button-head action screw, then tighten both action screws before installing the magazine release lever ('you will not be able to access the rear action screw once the magazine release lever is installed'). | [2] PDF p. 4 (PDF p. 4) | ||
| Action screws (front and rear) Mossberg Patriot SA/LA in an MDT Oryx chassis Reported by MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) (secondary) — not the manufacturer |
60–65 in-lb 6.8–7.3 N·m · 5–5.4 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'). Patriot LA: install the magazine latch after the rear action screw is secured. | [4] PDF p. 2 (inlet-specific torque table) (PDF p. 2) | ||
| Action screws (barreled action to UMC) Mossberg Patriot and Patriot-pattern actions in a Grayboe stock with Universal Mini Chassis (UMC) Reported by Grayboe (secondary) — not the manufacturer |
45 in-lb 5.1 N·m · 3.7 ft-lb |
For the Patriot the barreled action goes into the UMC first, then the trigger bow, then the UMC into the stock (UMC-to-stock screws 60 in-lb). | [5] p. Section 'Mossberg Patriot', Step 2 |
Notes: The manufacturer's documents give no torque value. They say: "Reinstall the action into the stock and tighten the front first, and then the rear, action screws." (Patriot Owner's Manual (doc 102353), PDF p. 6) "PERIODICALLY CHECK THAT THE MUZZLE BRAKE (IF SO EQUIPPED) IS TIGHTENED FIRMLY ONTO THE BARREL." (Patriot Owner's Manual (doc 102353), PDF p. 18)
Fit or check on rebuild
- Action screw torque — Mossberg-type pillar/screw torque affects zero.
- Trigger function and safety check — The LBA trigger is gunsmith-only per Mossberg, so check, don't adjust.
- Re-zero sights or scope — Sights and optics come off for coating, and point of impact must be re-confirmed. This is a standard check, so no source.
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
- Mossberg Patriot Owner’s Manual — O.F. Mossberg & Sons, Inc. primary
- Assembly Instructions for ONLY Mossberg Patriot AICS magazine Boyds Stocks — Boyds Gunstocks secondary
https://www.boydsgunstocks.com/docs/default-source/default-document-library/assembly-instructions-for-mossberg-patriot-aics-kit.pdf?sfvrsn=d1a676d_0 - Patriot Owner's Manual (doc 102353) — O.F. Mossberg & Sons, Inc. primary
https://resources.mossberg.com/hubfs/manuals/102353-Patriot-Owners-Manual.pdf - 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 - Grayboe — UMC (Universal Mini Chassis) Installation Instructions (web page) — Grayboe secondary
https://www.grayboe.com/pages/umc-installation-instructions
| 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.