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SGA® AMBIDEXTROUS BUTTSTOCK FOR MOSSBERG® 500/590 Reviews & Ratings

The SGA Stock is an ambidextrous, user-configurable buttstock designed to add much-needed adjustability to the tried-and-true Mossberg 500 / 590 / 590A1 12-gauge series of shotguns. Its features include a spacer system for length of pull adjustment, improved grip ergonomics, a recoil-reducing butt-pad, and optional cheek risers for use with optics/raised sights and other accessories.

The Mossberg SGA brings Magpul design and engineering to another classic American firearm. Available in Black, Flat Dark Earth, Stealth Gray and Orange to adapt to the mission at hand.

Made in the USA.

FEATURES

Spacer-adjustable lop in 1/2" increments from 12.5" to 14.5"
Recoil-reducing butt-pad
Integral right/left 1.25" sling loops

SPECS

Platform: Shotgun
Compatibility: Mossberg® 500/590/590A1 12-gauge
Butt-Pad Dimensions: 1.5 x 5.0 in.
LOP Adjustment Range: ~12.3-14.3 in.
Weight: 1.5 lbs. (with two Spacers installed)
Width of Butt, max: 1.5 in.

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5 Stars

94%

4 Stars

3 Stars

2 Stars

1 Stars

Reviews Summary

Overall, customers are very pleased with the Magpul SGA Ambidextrous Buttstock for Mossberg 500/590, highlighting its quality, comfort, and ease of installation. Many appreciate the adjustable features and solid build. A few reviewers noted minor installation challenges or design quirks, but these do not detract significantly from the positive reception of the product.

What Reviewers Are Saying

Product Quality

94%

Reviewers consistently praise the high quality of the Magpul buttstock, noting its solid build and thoughtful engineering. Many find it significantly enhances the shooting experience, with a comfortable fit and improved ergonomics enhancing control.

Ease of Installation

81%

Most customers found the installation process straightforward and quick, allowing them to easily upgrade their shotguns. Despite some mention of minor issues, the overall sentiment is that installation is hassle-free.

Adjustability

66%

The adjustable length of pull is frequently highlighted as a major benefit, accommodating shooters of different sizes and preferences. This feature has contributed to a more personalized shooting experience, making the product suitable for various users.

Comfort

66%

Many reviews emphasize the comfort of the stock, with particular commendation for the recoil pad that helps absorb shock during shooting. Users report that the natural grip angle enhances comfort, making it a favorable option for extended use.

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It's Fine

I picked this up for work as I was tired of my Knoxx Spec-Ops stock punching me in the face every time I shot. My only gripe so far is I had a GG&G single point sling mount that doesn't work with this BUT it would work just fine if Magpul would have included a longer stock bolt. Instead I have to buy their sling mount. But as of this review, it's not released yet?!? The forearm is fantastic and WAY better than the stock one. I also like the adjustable length of pull with the inserts on the stock. The ergonomics of the stock are great. It definitely looks weird, but everyone who owns anything Magpul knows there is a definite method to their madness.

Mossberg 500 stock

I bought the stock to put on a 20 gauge, knowing the receiver is smaller. No it is not a flush mount along the sides, but the difference is trivial to me; it did not matter. One thing I did adjust was the opening behind the trigger guard. This is a known problem for 12 gauge guns, too. You cannot remove the trigger assembly with the stock attached as is. Many use a Dremel. I used a dowel rod and 100-grit paper and did it in small steps. Very happy with the stock and the options I now have on 20g

Would you recommend this? Yes, I would recommend to a friend

by JOHN T. on October 14, 2025

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