The Magpul SGA is a fixed shotgun stock for Mossberg 500, 590 and 590A1 12-gauge shotguns, replacing the factory stock on standard stock hardware.
The Magpul SGA Stock for Mossberg 500/590/590A1 (MAG490) replaces the factory stock with a purpose-engineered design built around adjustable fit. Spacer-based length-of-pull adjustment tailors the stock to your build and your outerwear — shorter for armor or winter gear, longer for slighter frames in shirtsleeves — while the recoil-reducing buttpad takes the sting out of full-power 12-gauge loads.
The grip geometry is closer to vertical than a traditional field stock, giving better trigger control and a more natural wrist angle for defensive and working guns. Reinforced polymer construction, optional cheek risers for optics and sling mounting points complete a stock that turns a rattly factory pump into a fitted tool.
Key Features
- Spacer-adjustable length of pull: fit the gun to you, not vice versa
- Recoil-reducing buttpad: tames full-power 12-gauge loads
- Improved grip geometry: better trigger control and wrist angle
- Riser & sling compatible: supports optics and carry setups
- Four finishes: Black, Flat Dark Earth, Stealth Gray, Orange
Compatibility & Fitment
Fits Mossberg 500, 590 and 590A1 12-gauge shotguns, using the shotgun's existing stock mounting arrangement — a straightforward bench job with basic tools. If your gun is a less common variant or has already been altered, get in touch with the model and serial details before you buy. Set the spacers to your length of pull before final torque.
Technical Specifications
Platform | Mossberg 500, 590 & 590A1 (12 gauge) |
Fits | Standard factory stock mounting |
Material | Reinforced polymer |
Finish | Black, Flat Dark Earth, Stealth Gray, Orange |
Adjustment | Spacer-based length of pull |
US Shipping & Support
Shipped from D&R Sports Center in the USA with fast, tracked delivery. Questions on fit, mounting or which model suits your setup? Our team is glad to help before and after your purchase.
Frequently Asked Questions
Which Mossberg shotguns does the SGA fit?
The MAG490 fits Mossberg 500, 590 and 590A1 12 gauge shotguns. It replaces the factory stock and uses the shotgun's existing stock mounting arrangement. If your gun is a less common variant or has already been altered, get in touch with the model and serial details before you buy.
Why fit an SGA instead of the standard stock?
The SGA is a conventional, fixed shotgun stock rather than a pistol-grip design, so it keeps the familiar handling of a sporting shotgun while adding proper adjustability. Length of pull is set with spacers, which lets you tune the fit to your build and to whether you shoot in a jacket or light clothing. A cushioned buttpad takes the edge off 12 gauge recoil during longer sessions.
How does the spacer system work?
Spacers fit between the stock body and the buttpad, so you add or remove them to lengthen or shorten the pull. The usual method is to start short, then add spacers until the gun mounts cleanly without you having to reach or crowd the comb. Removing the buttpad to change spacers is an ordinary fitting job, not gunsmithing.
What colors are available and what pairs well with it?
It is offered in Black, Flat Dark Earth, Stealth Gray and Orange. Many owners fit the matching MOE M-LOK forend at the same time so both ends of the gun match in color and texture.
