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Magpul

Magpul SGA Stock (Mossberg 500/590/590A1)

Drop-in replacement stock for the Mossberg 500, 590, 590A1, and Maverick 88 with adjustable length-of-pull and adjustable comb height for optic use.

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Quick Specs

Price
$115
Weight
2 lb
Brand
Magpul
Category
stock

Features

  • Mossberg 500/590/590A1 fitment (model MAG490)
  • Adjustable LOP via 0.5" spacers (12.5" to 14.5")
  • Adjustable comb height for optic use
  • Multiple QD and loop sling attachment points

Capability Boosts

Mobility+1
Reliability+1

Recommended For

Home Defense
Duty/Patrol
Vehicle Operations
Outdoor Defense

Compatibility Tags

family: shotgunstock-interface: mossberg-590

Overview

The Magpul SGA Stock for the Mossberg 500/590 family (model MAG490) is the most popular aftermarket stock for these platforms because it solves the two biggest factory problems at once: fixed length-of-pull and a comb height that doesn't co-witness with a red dot. The stock ships with multiple 0.5-inch spacers that adjust LOP from approximately 12.5 to 14.5 inches, letting shooters tune fit for body armor, heavy clothing, or different shooters in a household. The included comb risers raise cheek weld geometry to align the eye with mounted optics on the receiver rail, which the factory plastic stock cannot do.

Installation is true drop-in: remove the factory stock bolt, slip the SGA on, torque the bolt back down, and the gun is ready. No fitting, no gunsmithing. The stock is compatible with the Mossberg 500, 500 ATI, 590, 590A1, 590S Tactical, and Maverick 88 (any 12 or 20 gauge variant using the standard Mossberg stock interface). It is NOT compatible with the Mossberg Shockwave (no stock) or the 590 Shockwave variants without a stock interface.

Sling attachment is the other strong point. The SGA includes ambidextrous QD sling cup positions plus traditional sling loops front and rear, so any sling system the user already runs (single-point, two-point, QD adapters) works without an additional purchase. Reinforced polymer construction holds up to standard 12-gauge recoil indefinitely; the angled rubber buttpad cuts felt recoil noticeably compared to the hard polymer factory pad.

For shooters running an optic on the 590A1's factory top rail, the SGA's adjustable comb is functionally mandatory. The factory stock's fixed comb forces a chin weld with most red dots, which destroys consistency. The SGA fixes that for under $120.

Key Features

  • Adjustable length-of-pull via 0.5" spacers (12.5" to 14.5")
  • Adjustable comb height with included risers (optics-compatible)
  • Ambidextrous QD sling cup positions
  • Traditional sling loop attachment front and rear
  • Drop-in installation (no fitting required)
  • Compatible with Mossberg 500, 590, 590A1, 590S, 835, Maverick 88
  • Angled rubber buttpad reduces felt recoil

Pros

  • +Adjustable LOP and comb height for any shooter or optic setup
  • +Drop-in installation with no gunsmithing
  • +Most affordable adjustable stock for the platform
  • +Ambidextrous sling attachment without adapters
  • +Cross-compatible with the entire 500/590 family
  • +Magpul polymer construction proven across millions of units

Cons

  • Spacer-based LOP not adjustable on the fly
  • Polymer is less rigid than the Mesa Urbino (acceptable trade for the price)
  • Not compatible with Shockwave or pistol-grip-only variants
  • Heavier than the factory stock

Detailed Specifications

Material
Reinforced polymer
lopAdjustment
12.5" to 14.5" via included spacers
combAdjustment
Adjustable risers included
buttpad
Angled rubber, anti-snag
slingMount
Ambidextrous QD cups + sling loops
compatibility
Mossberg 500, 590, 590A1, 590S, 835, Maverick 88
installation
Drop-in, no fitting
weight
32 oz

Compatible Platforms

+2 more

Pairs Well With

Top matches

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