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Fall Build Fest Continues - 15% OFF GUN PARTS THIS WEEK
Use Code: PARTS15

M4 BUTTSTOCK

M4 BUTTSTOCK Reviews & Ratings

Brownells M4 ribbed style adjustable stock.

This is the same style that has been used heavily by the military and can be found as the OEM option for many new AR-15s sold today.

Included a sling swivel and fits a Mil-Spec buffer tube (not included).

See all of our AR15s and AR15 parts here.

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5 Stars
43%
4 Stars
14%
3 Stars
29%
2 Stars
14%
1 Stars
0%
Reviews Summary
Many reviewers recognize the M4 Buttstock as a good quality product at a low price, but several report issues with the locking pin not holding its position. While some found an easy fix for this problem, concerns about quality control (QC) persist. Overall, it seems a solid option for those looking for an M4-style stock.
What Reviewers Are Saying
Product Quality
45%
Reviewers appreciate the overall quality of the M4 Buttstock, noting its good construction and materials. Many feel it meets their expectations for a budget item, particularly for M4 builds.
Quality Control Issues
60%
A significant concern among reviewers is the inconsistency in quality control, particularly regarding the locking pin mechanism which can lead to it not holding position. Several customers mention needing to adjust or fix components themselves, indicating a lack of factory-level quality assurance.
Value for Money
55%
Multiple reviews highlight the affordable price of the buttstock, suggesting it offers excellent value for what customers receive, especially compared to more expensive alternatives.
Adjustability and Compatibility
40%
Reviewers appreciate the adjustability of the buttstock, particularly for M4 setups. However, there are usability concerns raised regarding how easily the stock can detach due to improper adjustments, which some found problematic.
Appearance and Authenticity
35%
Some customers specifically mention the stock's appearance as being aesthetically pleasing and closely resembling genuine military-grade M4 stocks. This visual appeal, combined with markings such as the CAGE code, enhances the value of the product for collectors and enthusiasts.
5
Almost Government Issue
This stock is probably the closest you'll get to government issue. I bought it to replace the stock for my Ruger AR556. The Brownells stock is definitely better than the Ruger stock though they are very similar. I tried using a hasty sling with the Ruger stock and the rear sling loop rotated because it isn't enclosed on the left and right sides like the Brownells stock. Others commented that they couldn't install the stock without tearing down the adjustment lever mechanism. These stocks are among the easiest to install and remove compared to more expensive options. Probably the others don't know that you need to push down on the rear of the adjustment lever to lower the locking pin enough to clear the rear edge of the buffer tube (receiver extension). To adjust length of pull after installing the stock, you squeeze the adjustment lever. To install it you push down on the rear of the lever. You can test it out and see for yourself before attempting installation. There are more comfortable stocks on the market, that's true, but this stock is for those who want a setup more like a government issue M4. I like this stock and it is a great lower cost upgrade to the OEM Ruger stock.
Would you recommend this? Yes, I would recommend to a friend
by JOSEPH G. on March 17, 2026
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5
Great
Good quality and good price. Purchased for a basic M4 build
by EDMUND V. on January 27, 2024
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5
Mil-spec Colt contract stock
Cage code marked from same supplier from colt. These are genuine military grade M4 stocks. Perfect for my Colt clone rifle. Brownells is a great place to purchase quality part's
by WILLIAM S. on January 07, 2024
Verified Purchase
Was this review helpful? 9