Magpul Industries

Magpul SGA Stock for Mossberg 500/590/590A1 12 Gauge Shotguns

Name: Magpul SGA Stock for Mossberg 500/590/590A1 12 Gauge Shotguns
Brand: Magpul Industries
SKU: MAG490-BLK
Rating: 5.0 (1 reviews)

5.0 out of 5 · 1 review

£129.99

Tax included where applicable.

In stock7–10 day delivery

Colour: Black

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Delivery Information

Orders are dispatched from the United Kingdom with tracked delivery. You will receive tracking details by email once your order ships.

Returns & Refunds

Please see our Returns & Refunds policy for full details on returns and exchanges.

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SKU: MAG490-BLKUPC: 873750008523

Product Overview

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.

Why shooters choose the SGA (Mossberg)

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

Fit & installation

Fits Mossberg 500, 590 and 590A1 12-gauge shotguns using standard stock hardware — a straightforward bench job with basic tools. Set spacers before final torque.

Specifications

Model: MAG490
Platform: Mossberg 500, 590 & 590A1 (12 gauge)
Adjustment: Spacer-based length of pull
Material: Reinforced polymer
Finishes: Black, Flat Dark Earth, Stealth Gray, Orange

Make the shotgun yours. Order the SGA for Mossberg today — in stock at Xtreme Tactical Gun Parts with free UK delivery.

Explore more: Magpul Shotgun Stocks & Forends, Rifle & Shotgun Stocks or browse all Magpul.

Compatibility & Fitment

Fits Mossberg 500, 590 and 590A1 12 gauge shotguns.

Please confirm platform, interface and fitment requirements before ordering.

Technical Specifications

SKU / MPN	MAG490-BLK
UPC / Barcode	873750008523
Brand	Magpul Industries

Customer Reviews

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Shop Mossberg 500 & 590 Parts & Upgrades View category

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Product 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 ordering.

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 colours 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 colour and texture. You can see the whole family in Magpul shotgun stocks and forends.

How is delivery handled and can I send it back?

Shotgun stocks are sent from the United Kingdom with free tracked UK delivery, 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 contact us and we'll help sort it.