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Mossberg Patriot
- easy
- Shop tier 1
- medium confidence
- Rifle
- bolt action
- hunting
- budget
- detachable magazine
field strip ~2 min · reassembly ~3 min · detail strip ~30 min
Specifications
- Manufacturer
- O.F. Mossberg & Sons
- Origin
- United States
- Category
- Rifle
- Action
- Bolt action
- Calibers
- .308 Winchester, .30-06 Springfield, 6.5 Creedmoor, .300 Winchester Magnum
- Capacity
- 4 or 5 rounds in the detachable box magazine
- Production
- 2015–present (in-production)
- Also known as
- Patriot Predator, Patriot Synthetic
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.
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 rifles and carbines, for the full job: strip to the parts that get coated and put it back together working. 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.
Parts: 48 numbered parts (Complete rifle, removable-magazine models (48 line items, quantity 1 each; no part numbers)), from Patriot Owner's Manual (doc 102353) — O.F. Mossberg & Sons, Inc., p. 22–24 resources.mossberg.com [3].
Bench time: about 30 min to strip, 45 min to rebuild (estimate). Stock off, bolt detail strip, bottom metal and magazine. The LBA trigger is left as a unit.
Small parts: 3 pins, 5 springs, 1 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 / bottom metal: action screws, trigger guard / floorplate, magazine box, spring, follower, swivel studs, recoil pad or butt plate
- Bolt: firing pin assembly (shroud, cocking piece, mainspring), extractor, ejector and spring, extractor detent ball
- Receiver: trigger assembly (as a unit), bolt stop and spring, safety (if receiver-mounted), scope bases / iron sights
Special tools
- torque driver — Action screws
- bolt disassembly tool / vise — Compressing the firing-pin spring
Known pain points
- 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)
Source: Patriot Owner's Manual (doc 102353) — O.F. Mossberg & Sons, Inc. resources.mossberg.com [3] — “The bolt can be removed from the barreled action, and the barreled action can be removed from the stock, but further disassembly should be performed by a cer- tified gunsmith only.” - Several parts on the list are restricted to gunsmiths or the factory, so a lost or damaged spring cannot simply be reordered. (both)
Source: Patriot Owner's Manual (doc 102353) — O.F. Mossberg & Sons, Inc. resources.mossberg.com [3] — “* Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only”
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.
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 O.F. Mossberg & Sons'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 Mount a Scope at Home MOSSBERG
adjustment · 2022-10-19
Covers: Mossberg Patriot (per description: 'mount a new scope on his Mossberg Patriot')
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
Field StripBolt removal is the whole of routine maintenance on a bolt rifle. The bore cleans from the breech with the bolt out.
- 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.WarningThe rifle is unloaded at this point. Keep the muzzle in a safe direction regardless.TipMakers 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.Removed at this step:
Bolt assembly - Clean the bore from the breech using a bore guide, and clean the bolt face, lugs, and chamber.WarningAlways use a bore guide.
- Stop here for routine maintenance. Bolt disassembly and stock removal are separate procedures and are not part of normal cleaning.
Reassembly
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 requiredFor a deep clean or bedding work. Not routine maintenance.
- 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 screwsFloorplate 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
No sourced torque values from the manufacturer are recorded for this firearm. Where a fastener has a specified torque — action screws, scope bases, muzzle devices, barrel nuts — get it from the manufacturer or a gunsmith rather than estimating it.
What the manufacturer does say: 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)
Reported by other sources — not the manufacturer
| Fastener | Torque | Who says so, and their words | Where it comes from |
|---|---|---|---|
| Action screws (2) Mossberg Patriot in a Boyds stock with the AICS-magazine kit |
45 in-lb 5.1 N·m · 3.7 ft-lb |
Reported by Boyds Gunstocks 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'). “-Tighten the 2 action screws to 45in/lbs, you will not be able to access the rear action screw once the magazine release lever is installed.” |
Assembly Instructions for ONLY Mossberg Patriot AICS magazine Boyds Stocks — Boyds Gunstocks, PDF p. 4 boydsgunstocks.com [2] |
| Action screws (front and rear) Mossberg Patriot SA/LA in an MDT Oryx chassis |
60–65 in-lb 6.8–7.3 N·m · 5–5.4 ft-lb |
Reported by MDT Sporting Goods Ltd. (Modular Driven Technologies, MDT) 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. “Mossberg Patriot SA/LA — 3/16” Hex Wrench — 60-65 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 (barreled action to UMC) Mossberg Patriot and Patriot-pattern actions in a Grayboe stock with Universal Mini Chassis (UMC) |
45 in-lb 5.1 N·m · 3.7 ft-lb |
Reported by Grayboe 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). “Set the barreled action into the mini chassis. Install the two supplied action screws (same length front and rear). Torque both screws to 45 inch-pounds.” |
Grayboe — UMC (Universal Mini Chassis) Installation Instructions (web page) — Grayboe, p. Section 'Mossberg Patriot', Step 2 grayboe.com [5] |
Parts list
Transcribed from the manufacturer's parts list (Patriot Owner's Manual (doc 102353) — O.F. Mossberg & Sons, Inc., p. 22–24 resources.mossberg.com [3]) — "PATRIOT BOLT ACTION CENTERFIRE RIFLE (REMOVABLE MAGAZINE MODELS)" list, p. 22, with exploded views on pp. 23–24. The separate 33-row FIXED MAGAZINE MODELS list (p. 25) is left out. No part numbers.. Key numbers refer to the exploded view in that document.
48 parts
| Key | Part | Part no. | Qty | Group |
|---|---|---|---|---|
| 1 | RECEIVER * Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only | 1 | ||
| 2 | BOLT STOP * Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only | 1 | ||
| 3 | BOLT STOP SCREW * Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only | 1 | ||
| 4 | BOLT STOP SPRING * Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only | 1 | ||
| 5 | SCOPE MOUNT, REAR | 1 | ||
| 6 | SCOPE MOUNT SCREWS, REAR | 1 | ||
| 7 | SCOPE MOUNT, FRONT | 1 | ||
| 8 | SCOPE MOUNT SCREWS, FRONT | 1 | ||
| 9 | BARREL * Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only | 1 | ||
| 10 | BARREL LOCK NUT * Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only | 1 | ||
| 11 | RECOIL LUG * Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only | 1 | ||
| 12 | STRIKER ASSEMBLY | 1 | ||
| 13 | BOLT BODY ASSEMBLY | 1 | ||
| 14 | BOLT HEAD ASSEMBLY PIN | 1 | ||
| 15 | BOLT HEAD * Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only | 1 | ||
| 16 | EJECTOR | 1 | ||
| 17 | EJECTOR SPRING | 1 | ||
| 18 | EJECTOR PIN | 1 | ||
| 19 | EXTRACTOR | 1 | ||
| 20 | EXTRACTOR DETENT BALL | 1 | ||
| 21 | EXTRACTOR SPRING | 1 | ||
| 22 | TRIGGER HOUSING ASSEMBLY * Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only | 1 | ||
| 23 | TRIGGER HOUSING SCREW * Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only | 1 | ||
| 24 | TRIGGER HOUSING WASHER * Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only | 1 | ||
| 25 | STOCK SYNTHETIC | 1 | ||
| 26 | RECOIL PAD | 1 | ||
| 27 | RECOIL PAD SCREWS | 1 | ||
| 28 | MAGAZINE | 1 | ||
| 29 | MAGAZINE SPRING | 1 | ||
| 30 | FOLLOWER | 1 | ||
| 31 | MAGAZINE GUIDE | 1 | ||
| 32 | LATCH SPRING | 1 | ||
| 33 | LATCH | 1 | ||
| 34 | LATCH PIN | 1 | ||
| 35 | REAR ACTION SCREW | 1 | ||
| 36 | FRONT ACTION SCREW | 1 | ||
| 37 | SWIVEL STUDS | 1 | ||
| 38 | BARREL (OPEN SIGHTS) * Items on Parts List are reserved for qualified gunsmiths or the Authorized Product Center Only | 1 | ||
| 39 | REAR SIGHT ASSEMBLY (WITH SCREWS) | 1 | ||
| 40 | FRONT SIGHT ASSEMBLY (WITH SCREWS) | 1 | ||
| 41 | STOCK, WOOD | 1 | ||
| 42 | RECOIL PAD | 1 | ||
| 43 | RECOIL PAD SCREWS | 1 | ||
| 44 | TRIGGER GUARD | 1 | ||
| 45 | REAR TRIGGER GUARD SCREWS | 1 | ||
| 46 | PISTOL GRIP CAP | 1 | ||
| 47 | PISTOL GRIP CAP SCREW | 1 | ||
| 48 | PISTOL GRIP CAP COVER | 1 |
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.
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. |
Similar manual of arms
Sourcing
- Confidence
- medium — Drawn from reliable secondary sources and consistent across references, but not confirmed against a primary source.
- Verification
- Community reviewed only
- 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] Mossberg Patriot Owner’s Manual — O.F. Mossberg & Sons, Inc. manufacturer manual primary source
- [2] Assembly Instructions for ONLY Mossberg Patriot AICS magazine Boyds Stocks — Boyds Gunstocks manufacturer manual secondary source
https://www.boydsgunstocks.com/docs/default-source/default-document-library/assembly-instructions-for-mossberg-patriot-aics-kit.pdf?sfvrsn=d1a676d_0 (checked 2026-09-27) - [3] Patriot Owner's Manual (doc 102353) — O.F. Mossberg & Sons, Inc. manufacturer manual primary source
https://resources.mossberg.com/hubfs/manuals/102353-Patriot-Owners-Manual.pdf (checked 2026-09-27) - [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] Grayboe — UMC (Universal Mini Chassis) Installation Instructions (web page) — Grayboe website secondary source
https://www.grayboe.com/pages/umc-installation-instructions (checked 2026-10-11)
Notes: Corrected on 2026-09-15: this entry carried a generic claim that bolt rifles will not release the bolt with the safety engaged. That claim has since been checked against five makers' factory manuals and is wrong more often than it is right, so it has been replaced with a direction to check this rifle's own manual. The safety direction for THIS rifle is still unverified: mossberg.com answers automated requests with a 403, so the factory manual could not be read here. Of the four rifles that carried this boilerplate, this is the only one still unresolved. Rated medium pending confirmation of the exact bolt release location and action screw torque against the factory manual for your configuration.