Magpul SGA Stock for Mossberg 500/590/590A1 12 Gauge Shotguns
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Fits Mossberg 500, 590 and 590A1 12 gauge shotguns.
Not sure it fits your rifle? Ask us before you order
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 shotgun stock that finally fits — Magpul's SGA transforms how a Mossberg 500-series mounts, points and recoils.
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 armour or winter kit, 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.
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 ordering. Set the spacers to your length of pull before final torque.
| 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 |
| Brand | Magpul Industries |
| MPN | MAG490-BLK · MAG490-FDE · MAG490-GRY · MAG490-ORG |
Make the shotgun yours. Order the SGA for Mossberg today — imported from the USA with all duties paid by us and dispatched tracked from the UK in 7–10 business days, with nothing to pay on delivery.
Explore more: Magpul Shotgun Stocks & Forends, Rifle & Shotgun Stocks or browse all Magpul.
| 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 |
| Brand | Magpul Industries |
| MPN | MAG490-BLK · MAG490-FDE · MAG490-GRY · MAG490-ORG |
| Category | Shotgun Stock |
| Shipping weight | 2.0 kg |
| Barcode | 873750008523 |
£5 tracked UK delivery on every order via Royal Mail Tracked 24. Our products are ordered in from the manufacturer rather than held in UK stock, so please allow 7 to 10 business days (Monday to Friday, excluding bank holidays) from the date of your order for it to reach you. Tracking details are emailed on dispatch. UK delivery only.
You have 30 days from receiving your order to cancel it for any reason, then 14 days to send it back unused and in its original packaging. Faulty, damaged or incorrect items are replaced or refunded and we cover reasonable return postage. Refunds go back to your original payment method within 14 days of receiving the return.
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 ordering.
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.
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.
It is offered in Black, Flat Dark Earth, Stealth Gray and Orange. Many owners fit the matching <a href="/products/magpul-moe-m-lok-forend-mossberg-590-590a1">MOE M-LOK forend</a> at the same time so both ends of the gun match in colour and texture. You can see the whole family in <a href="/collections/magpul-shotgun-stocks-forends">Magpul shotgun stocks and forends</a>.
Shotgun stocks are sent from the United Kingdom with £5 tracked UK delivery in 7–10 business days, and you'll get tracking by email when it ships. If a part turns out to be the wrong fit, see our returns policy or <a href="/pages/contact">contact us</a> and we'll help sort it.
7 to 10 business days from the date of your order. Every order is sent Royal Mail Tracked for a flat £5 and you receive tracking details by email when it is dispatched.
Yes. We list only genuine parts and optics from the brands shown, ordered in from the manufacturer for your order.
Compatibility notes on this page come from the manufacturer. If you are unsure, email us with your make and model before ordering and we will check rather than guess.
Yes. Bundle & Save applies automatically in your basket: 5% off when you buy 2 items, 10% off at 3 items and 15% off at 4 or more. It works across the whole range, so you can mix and match, and there is no code to enter.
Yes — you have 30 days from delivery to cancel for any reason, as long as the item is unused and in its original packaging. See our returns policy for the details.
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