Availability: In Stock
The Magpul SGA shotgun stock for Mossberg 500/590/590A1 12-gauge shotguns transforms how your shotgun handles and feels. If you've run a Mossberg tactical shotgun or home-defense gun, you know the factory stock is purely functional—and that's where the SGA steps in. Magpul engineered this ambidextrous stock to solve real problems: poor ergonomics, fixed length of pull, and minimal recoil management. Whether you're outfitting a duty gun, running 3-gun matches, or setting up a home-defense shotgun, the SGA gives you the adjustability and control that modern shooters expect.
The stock's spacer system lets you dial in your ideal length of pull across a ~12.3 to 14.3-inch range in half-inch increments—crucial if you shoot in heavy gear, swap between shooters, or just want a precise fit. The integrated recoil-reducing butt pad handles the snap of 12-gauge magnum loads better than the plastic factory pad, and the ergonomic grip design gives you a solid, controllable purchase. Ambidextrous 1.25-inch sling loops are molded in, so you can mount a two-point or single-point sling without drilling or wrapping paracord around the receiver.
Built from durable synthetic polymer in Flat Dark Earth finish, the SGA is as tough as your shotgun. It's made in the USA by Magpul, the outfit known for aftermarket AR and AK parts that work. If you're running optics or raised sights, optional cheek risers (sold separately) let you achieve proper sight picture without awkward head position. Drop-in installation—no gunsmithing required.
| Platform | Shotgun |
| Compatibility | Mossberg 500/590/590A1 12-gauge |
| Length of Pull Range | ~12.3–14.3 inches (adjustable) |
| Butt-Pad Dimensions | 1.5 x 5.0 inches |
| Maximum Butt Width | 1.5 inches |
| Weight | 1.5 lbs (with two spacers installed) |
| Sling Loop Size | 1.25 inches, ambidextrous |
| Finish | Flat Dark Earth Synthetic |
Yes—the SGA is designed specifically for Mossberg 500, 590, and 590A1 12-gauge shotguns. It's a direct drop-in replacement for the factory stock; no modifications to your shotgun are needed.
The stock uses a spacer system that allows adjustment in 0.5-inch increments, spanning approximately 12.3 to 14.3 inches. You simply add or remove spacers to fine-tune fit for different shooters or gear setups.
The SGA is compatible with optional cheek risers (sold separately) that help you achieve proper sight alignment when running optics or raised sights on your shotgun.
The SGA stock comes ready to install on your Mossberg with all necessary components. Cheek risers are optional accessories sold separately if you need them for your setup.
SKU: 115647243 • Width: 7.1in • Height: 2.2in • Depth: 13in • Weight: 2.14oz