Fall Build Fest Continues - 15% OFF GUN PARTS THIS WEEK
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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.
3
Defective assembly by the manufacturer.
The locking pin was not correctly adjusted at the factory. I had the same problem as another reviewer here--if the shooter keeps the release lever depressed while extending the stock then it will simply slide off the buffer tube. The stock should only come off the tube when the forward portion of the release lever is pulled outward. Fortunately this is an easy fix by driving out a roll pin and turning the locking pin to give more protrusion into the stock channel. The stock is of good quality, fairly priced but has poor QC. Marked with CAGE code 8FW25. I recommend that purchasers of this stock check for correct function. If a rifle is slung upside down and the release lever is inadvertently depressed, there is a possibility that the stock will detach and the rifle will fall to the ground if the locking pin was not correctly installed.
Would you recommend this? Yes, I would recommend to a friend
by AZ D. on October 26, 2025
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Was this review helpful? 2
3
Cheap But Flawed
The pin in the adjustment lever is adjusted wrong and it can be just pulled off the tube without over extending the lever. I had to drive out the pin, run the screw all the way down and drive in a new pin to get it to work properly.
Would you recommend this? Yes, I would recommend to a friend
by ROBERT T. on August 20, 2025
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Was this review helpful? 2