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Stoeger M3000

• moderate
• Shop tier 2
• medium confidence
• Shotgun
• semi auto shotgun
• inertia driven
• no gas system
• budget
• hunting

field strip ~4 min · reassembly ~6 min · detail strip ~25 min

Specifications

Model-specific safety

• The M3000 uses the Benelli inertia system. The inertia spring between the bolt head and bolt body is what makes it work — if it is missing, misassembled, or drowned in oil, the shotgun will not cycle.
• An inertia gun needs the shooter’s body to provide resistance. Holding it loosely can cause failures to cycle. That is a characteristic of the system, not a defect.
• Do not over-lubricate. Excess oil in the bolt damps the inertia spring.
• Unloading a tube magazine takes several cycles. Verify both the chamber and the tube.

Under spring tension

• Inertia spring in the bolt
• Recoil spring in the stock tube
• Magazine tube spring

Easily lost parts

Inertia spring · Locking head pin · Firing pin and retaining pin

Tools

No tools required for the field strip.

Shop difficulty

Shop tier 2 Tier 2 — moderate among shotguns, for the full job: strip to the parts that get coated and put it back together working. 85 parts across seven assembly drawings on a Benelli-pattern inertia action; the bolt group has a firing pin under spring pressure, a locking head that goes in one way, and an inertia spring whose omission makes the gun unsafe, and Stoeger reserves trigger-group stripping for a gunsmith. No timing.

Parts: 85 numbered parts (Seven assembly drawings with legends (trigger group T01-T26, bolt M01-M17, barrel N01-N09, fore-end E01-E07, magazine tube S01-S07, receiver G01-G10, stock D01-D09) - the complete gun), from Stoeger M3000 Owner's Manual — Stoeger Industries, p. 21–28 stoegerindustries.com [2].

Bench time: about 50 min to strip, 70 min to rebuild (estimate). As Benelli M2 pattern; 85 listed parts.

Small parts: 17 pins, 18 springs, 9 detents or plungers (counted from the manufacturer's parts list (one per key number unless a quantity is given))

What comes off for coating

• Barrel / magazine: magazine cap, fore-end, barrel, magazine spring and follower (retainer)
• Receiver: trigger group pin(s) and trigger group, bolt assembly and cocking handle, carrier latch / cartridge drop lever
• Bolt: firing pin retaining pin, firing pin and spring, locking head pin and locking head, inertia spring, extractor pin, extractor and spring
• Trigger group: trigger group T01-T26 (Stoeger: gunsmith only)
• Stock / recoil tube: recoil pad, stock nut, spring washer and plate, stock and drop shims, recoil spring, plunger and link, recoil spring tube (bare-receiver jobs; often thread-locked) — 13-17 mm socket on extension, padded vise, heat gun

Special tools

• Long 13-17 mm socket on extension — Buttstock nut on the tension rod
• Padded vise and heat gun — Freeing a thread-locked recoil spring tube
• Punch set incl. 3/32 in. — Trigger group and bolt pins

Known pain points

• The bolt group must be assembled in a set order with the inertia spring between locking head and bolt; Stoeger warns improper assembly can cause an accidental discharge. (reassembly)
  Source: Stoeger M3000 Owner's Manual — Stoeger Industries stoegerindustries.com [2] — “Improper assembly of the bolt group can cause accidental discharge resulting in serious injury or death.”
• The firing pin is under spring pressure and has to be held with its spring while the retaining pin is pulled or refitted. (both)
  Source: Stoeger M3000 Owner's Manual — Stoeger Industries stoegerindustries.com [2] — “CAUTION: The firing pin is under spring pressure.”
• The locking head only goes in one way: its slanted stem faces must be hidden. (reassembly)
  Source: Stoeger M3000 Owner's Manual — Stoeger Industries stoegerindustries.com [2] — “The slanted surfaces on the locking head's stem should not be visible once the bolt-locking head is mounted.”
• Stoeger does not recommend stripping the trigger group except by a qualified gunsmith. (both)
  Source: Stoeger M3000 Owner's Manual — Stoeger Industries stoegerindustries.com [2] — “Further dis- assembly of the trigger group is not recommended, except by a qualified gunsmith.”

Fit or check on rebuild

• Recoil tube support and torque — The aluminium recoil tube is easily crushed or bent; refit square and tight without clamping the tube.
  Source: Benelli Super Black Eagle recoil spring replacement — Canadian Gun Nutz canadiangunnutz.com [3] — “I am fearful of getting the vice too tight and collapsing the tube.”
• Link seated on the recoil spring plunger — If the link misses the plunger when the bolt goes in, the gun will not cycle.
• Function check: safety, trigger/sear release, disconnector and feeding with dummy rounds — Standard after any detail strip; a mis-assembled sear or disconnector can double or fail to fire.

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

Procedures

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: "Following assembly, and especially after firing a few rounds, make certain the forend cap is tightened firmly." (Stoeger M3000 Owner's Manual, PDF p. 19)

Parts list

Transcribed from the manufacturer's parts list (Stoeger M3000 Owner's Manual — Stoeger Industries, p. 21–28 stoegerindustries.com [2]) — 'Technical Drawings and Parts Lists': seven assembly drawings with legends (Trigger group T01-T26, Bolt M01-M17, Barrel N01-N09, Fore-end E01-E07, Magazine tube S01-S07, Receiver G01-G10, Stock D01-D09) plus the Model 3000 exploded view (p.28).. Key numbers refer to the exploded view in that document.

Function check

• Verify the shotgun is unloaded — chamber and magazine tube — before each step.
• Cycle the action by hand and confirm the bolt locks fully into battery.
• With the hammer cocked, engage the safety and press the trigger. The hammer must not fall.
• Disengage the safety and press the trigger. The hammer should fall.
• Confirm the bolt locks open when retracted and releases with the carrier release.
• Load two dummy shells into the magazine and confirm they feed and eject one at a time.
• Confirm the magazine cap is tight.

Maintenance

Lubrication points

• Bolt body and locking lug
• Magazine tube exterior
• Action bars or link
• Hammer and sear pivots

Cleaning notes

Inertia guns need very little lubricant and no gas system cleaning. Keep the inertia spring and bolt interior clean and essentially dry — excess oil there damps the spring and is the most common self-inflicted cause of cycling failures.

Suggested inspection interval: roughly every 2000 rounds. This is a general guideline, not a manufacturer specification.

Wear parts to inspect

Inertia spring · Bolt head locking lugs · Extractor and spring · Recoil spring in the stock tube

Common issues

Also covers

The procedures above are reported to apply to: Stoeger M3500 · Stoeger M3020. Verify against the manual for your specific model.

Similar manual of arms

• Benelli M2

Sourcing