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Maverick 88

• easy
• Shop tier 1
• medium confidence
• Shotgun
• pump action
• tube magazine
• budget
• crossbolt safety

field strip ~3 min · reassembly ~5 min · detail strip ~25 min

Specifications

Model-specific safety

• The Maverick 88 is built on the Mossberg 500 action but its safety is a crossbolt button in the trigger guard, not the Mossberg tang safety. If you also own a 500, the two safeties are in completely different places and operate differently. Know which gun is in your hands.
• Unloading a tube magazine takes several cycles. Verify both the chamber and the tube.
• Because the safety is in the trigger guard, the trigger housing is not directly interchangeable with a Mossberg 500 trigger housing.

Under spring tension

• Magazine tube spring and follower
• Hammer spring

Easily lost parts

Trigger housing pin · Magazine cap · Cartridge stops

Tools

No tools required for the field strip.

Shop difficulty

Shop tier 1 Tier 1 — easy among shotguns, for the full job: strip to the parts that get coated and put it back together working. 27 listed items (trigger housing and bolt as assemblies) on the simple 500-pattern action with a crossbolt safety in the trigger housing instead of the tang safety's detent; the only traps are the bolt-slide/action-bar alignment and the hammer-cocked order.

Parts: 27 numbered parts (Single shared parts list for the Maverick 88 and 91 (rows 12 and 12a model-specific), names only), from Owner's Manual for Maverick 88 and 91 Models (doc 13002) — O.F. Mossberg & Sons, Inc., p. 22–23 resources.mossberg.com [3].

Bench time: about 25 min to strip, 40 min to rebuild (estimate). Simplest Mossberg-pattern strip; crossbolt safety in the trigger housing instead of the tang detent.

Small parts: 1 pins, 1 springs, 0 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 and magazine: barrel (takedown screw or magazine cap), magazine spring retainer, spring and follower, magazine tube from receiver (optional) — strap wrench, padded vise
• Forend / action slide: action slide tube nut, forend, anti-rattle spring — tube nut tool
• Receiver: trigger housing pin and trigger housing, elevator, cartridge stop and interrupter, bolt and bolt slide, ejector
• Bolt: bolt lock pin and bolt lock, extractor pins, extractors and springs, firing pin retaining pin, firing pin, washer and spring
• Trigger housing: hammer, trigger, sear and disconnector group on their pins (only if the housing itself is being coated; Mossberg advises
• Stock / grip: recoil pad screws and pad, stock bolt, lock washer and washer — long 1/2 in. or 13 mm socket on extension

Special tools

• Tube nut tool — Forend action slide tube nut
• Strap wrench and padded vise — Magazine tube off the receiver
• Long socket extension — Stock bolt deep in the buttstock
• Roll/pin punches 1/16-1/8 in. — Bolt extractor and firing pin pins

Known pain points

• The bolt, bolt slide and both action slide bars have to go back in the same relationship they came out; a bar out of its cut or a bolt slide offered at the wrong point of forend travel will not drop in or binds the action. (reassembly)
  Source: Owner's Manual for Maverick 88 and 91 Models (doc 13002) — O.F. Mossberg & Sons, Inc. resources.mossberg.com [3] — “Pay special attention to the position of the bolt, bolt slide and action slide bar assembly during this portion of the disassembly, as the parts must be in the same relationship during reassembly.”
• The magazine spring bears on the retainer and the barrel takedown screw, so the retainer can launch when it is pried out or refitted. (both)
  Source: Owner's Manual for Maverick 88 and 91 Models (doc 13002) — O.F. Mossberg & Sons, Inc. resources.mossberg.com [3] — “The magazine spring exerts pressure on the retainer, use caution when assembling or disassembling.”
• Owners report the shell stop and interrupter get jammed in wrong and the action bars mis-seated when the gun is forced together; it only runs once everything lines up. (reassembly)
  Owners report: Seeking help from someone who owns a Mossberg 500 in the Bay Area — Calguns.net calguns.net [6] — “mossbergs are great but they can be harder to put back together. it sounds like the action bars are not in the right spot. also i will bet the shell stop and interrupter are jammed in wrong.”
• The hammer must be at full cock to get the trigger housing back in, and the safety must be on to reinstall the bolt; neither is obvious and forcing it damages parts. (reassembly)
  Source: The Mossberg Model 500: History & Disassembly — American Rifleman (NRA) americanrifleman.org [7] — “Be aware that the hammer must be in the full-cock position for reinsertion of the trigger assembly and that the safety must be in the “on” position to re-install the bolt assembly.”

Fit or check on rebuild

• Magazine tube torqued and aligned to the barrel lug — Tube carries the barrel; it is refitted hand-tight-plus with a strap wrench and must line up with the takedown screw or cap.
  Source: TM 9-1005-338-13&P — Department of the Army archive.org [8] — “Place strap style pipe wrench around magazine tube assembly (2) and turn to the left (counterclockwise),”
• 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

Notes: The manufacturer's documents give no torque value. They say: "Slide the barrel into the receiver and tighten the takedown screw, finger tight only. DO NOT use pliers or a wrench to tighten the takedown screw." (Owner's Manual for Maverick 88 and 91 Models (doc 13002), PDF p. 5) "Using Allen wrench supplied, tighten bolt very snugly." (Owner's Manual for Maverick 88 and 91 Models (doc 13002), PDF p. 20)

Reported by other sources — not the manufacturer

Parts list

Transcribed from the manufacturer's parts list (Owner's Manual for Maverick 88 and 91 Models (doc 13002) — O.F. Mossberg & Sons, Inc., p. 22–23 resources.mossberg.com [3]) — Single shared "PARTS LIST" for the Maverick 88 and 91; rows 12 (M 88) and 12a (M 91) are model-specific. Names only, no part numbers. Exploded view "88™ and 91™ Models" is on p. 23.. 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 fully. It should run smoothly without binding and lock closed.
• With the action closed and 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.
• With the hammer down, confirm the action will not open until the action release is pressed.
• Load two dummy shells into the magazine and confirm they feed and eject cleanly, one per cycle.

Maintenance

Lubrication points

• Action bars where they ride in the receiver
• Bolt body and locking block
• Magazine tube exterior where the forend slides
• Hammer and sear pivots

Cleaning notes

Keep the magazine tube interior clean and dry rather than oiled — oil there collects plastic wad residue and slows the follower. Plastic fouling in the chamber and bore is normal with shotshells.

Suggested inspection interval: roughly every 1000 rounds. This is a general guideline, not a manufacturer specification.

Wear parts to inspect

Extractor · Shell latches · Magazine spring · Action bars (inspect for bends) · Ejector

Common issues

Similar manual of arms

• Mossberg 500 / 590

Sourcing