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M4 Stock Wrench
M4 Stock Wrench
M4 Stock Wrench
M4 Stock Wrench
None
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ROCK RIVER ARMS - M4 Stock Wrench

76 Reviews
M4 Stock Wrench
Brownells #
739000010
MFR #
AR0165
UPC
842834100804
$5.99
Coupon Code
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International purchase information

Specifications
Make Model Fit:
AR-15.Universal
Restriction
Gun Tool Restriction:
Yes
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What is the ROCK RIVER ARMS - M4 Stock Wrench?

Steel, dual function wrench lets you easily remove your old extension tube and install a new-style, A4 stock. Spanner has three lugs to fit the A4-style castle nut. Provides a non-slip fit so you can hand tighten the castle nut to the receiver. Also, the comfortable, rubber coated handle features a cutout to fit the receiver extension tube to remove the A1 or A2 stock.


SPECS: Steel, parkerized finish. 7-5/8" (19.3cm) long.


See all of our AR15s and AR15 parts here.

Gun Tool Restriction
Gun Tools have restricted shipping to CA.

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AR-15 M4 STOCK WRENCH REVIEWS

3.8
76 Reviews
5 Stars
50%
4 Stars
16%
3 Stars
9%
2 Stars
14%
1 Stars
11%
Reviews Summary
The AR-15 M4 Stock Wrench offers mixed reviews. While many appreciate its affordability and sufficient performance for occasional users, several noted durability issues with the material and fit. Some customers reported it worked well for simple tasks, but others faced complications with tighter bolts, recommending better quality tools for frequent use.
What Reviewers Are Saying
Product Durability
45%
Many reviewers express concerns about the low durability of the wrench, highlighting issues with bending, stripping, and breaking after limited use. Several users suggest that for those frequently working on ARs, a more robust tool would be necessary.
Ease of Use
60%
Several reviews praise the wrench for its simplicity and ease of use. Users have found it effective for basic tasks like installing and removing castle nuts, especially when approached with the right technique. However, some users warn that it requires careful handling to avoid slipping and damaging components.
Value for Money
50%
Positive remarks frequently mention the wrench's affordability, making it a suitable option for occasional users or beginners. However, several users caution that the low price reflects the quality, suggesting that more demanding tasks may require investing in pricier alternatives.
Quality Control Issues
35%
Numerous reviews pointed out inconsistencies in manufacturing, including poorly manufactured notches that resulted in improper fitting. This theme suggests a need for better quality control to ensure all tools perform as expected.
Comparison to Higher-End Tools
40%
Reviewers often compare this budget wrench to more expensive options, highlighting that while it may suffice for light tasks, it falls short in durability compared to premium alternatives. Users with extensive experience recommend investing in a higher-quality tool for regular use.
5
Fantastic Value
Hard to beat the price for this quality wrench!
Would you recommend this? Yes, I would recommend to a friend
by DAVID HAN on June 04, 2026
Verified Purchase
Was this review helpful? 0
5
AR Stock Wrench
Excellent wrench for the price. Made the build go so much smoother. I recommend it. The rest of this is to meet the character minimum.
Would you recommend this? Yes, I would recommend to a friend
by AL CULBERTSON on December 08, 2025
Verified Purchase
Was this review helpful? 0
5
Great Castle nut wrench
For the price, you cannot beat it. I have purchased several of these over the years and given them as gifts to my friends getting into guns.
Would you recommend this? Yes, I would recommend to a friend
by PW on April 21, 2025
Was this review helpful? 1
5
No lower
No lower
by RIC SENEFF on March 26, 2025
Verified Purchase
Was this review helpful? 0
5
Nice little tool
I bought this when I bought the folding stock adapter so I could work on my AR-15. I was surprised at how heavy and thick it was and good quality for the price. Worth the money to work on your AR.
Would you recommend this? Yes, I would recommend to a friend
by VALENTIN SANCHEZ on June 23, 2024
Verified Purchase
Was this review helpful? 1
View All 76 Reviews
Customer Questions
8 Questions