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AR-15/M16 MIL-SPEC BUFFER TUBE 6 POSITION

AR-15/M16 MIL-SPEC BUFFER TUBE 6 POSITION Reviews & Ratings

AR-15/M16 MIL-SPEC BUFFER TUBE 6 POSITION

Brownells AR-15 Mil-spec receiver 6 position extension tube has the correct 1.148" outside diameter to ensure proper fit of adjustable mil-spec carbine stock. Allows you to install a mil-spec stock on a commercial carbine, convert a rifle with a fixed A2 style stock to an adjustable M4 stock, or complete a custom build. Six machined notches on the underside prevent the stock locking pin from slipping, yet still offer outstanding ease and flexibility in setting the buttstock length. Precision machined from strong, lightweight 7075 aluminum, then hardcoat anodized with a hard, wear-resistant matte black finish.


SPECIFICATIONS:
  • Material: 7075 Aluminum
  • Finish: Hard Coat Anodized
  • Color: Black
  • Fit: MIL-SPEC
  • Outside Diameter: 1.148"

See all of our AR15s and AR15 parts here.

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5 Stars
83%
4 Stars
4%
3 Stars
9%
2 Stars
0%
1 Stars
4%
Reviews Summary
Customers generally find the AR-15/M16 mil-spec buffer tube functional and well-priced, appreciating its ease of installation and compatibility with various stocks. However, packaging issues and inconsistent internal finish quality have raised concerns. Some users reported rough inner finishes affecting cycling smoothness, while others noted durability problems after limited use.
What Reviewers Are Saying
Product Quality
65%
Many reviewers mention the overall quality of the buffer tube, highlighting good fit and solid construction. However, some complaints about rough internal finish and premature wear signal room for improvement. The mix of positive and negative feedback suggests that while many find it satisfactory for the price, there are inconsistencies.
Installation and Compatibility
70%
Reviewers consistently appreciate the ease of installation of the buffer tube, with multiple mentions of it fitting well with various stocks and lower receivers. This theme reflects customers' satisfaction with how adaptable the product is in their builds, making it a reliable choice for DIY enthusiasts.
Shipping and Packaging
30%
A notable concern among users is the packaging during shipping. Several reviews mention inadequate packaging that led to damaged items upon arrival. This has led to frustrations regarding the expectations of receiving a new product in good condition and has been a common issue noted by reviewers.
Value for Money
50%
The buffer tube is frequently praised for being cost-effective, with users feeling they received good quality for a lower price. However, considerations about durability in relation to price suggest that budget-conscious consumers should weigh potential compromises in long-term use.
Durability Concerns
25%
A few reviews express concerns regarding the tube's durability, citing signs of wear and issues when subjected to regular firearm use. These reviews indicate that while the buffer tube might be a great budget option, some buyers question its longevity with demanding use.
5
pistol buffer tube
Good price, fast shipping, proper fit with no concerns
by Herman Schorkhuber on March 30, 2026
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5
Quality buffer tube
Good part, quality machining and tight threads A++++++++++++++++++++++++++++++++++++++++++++++++++++
by JOSHUA CASS on February 13, 2026
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5
Excellent Buffer Tube
The Brownell’s buffer tube was finished very nicely and the threads are machined perfectly . The installation was flawless. I highly recommend this buffer tube for your next build or replacement. Bill Mart
Would you recommend this? Yes, I would recommend to a friend
by WILLIAM T. MARR III on January 22, 2026
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5
See my review
These are perfect fit for the Magpul PRS Lite stock, which I didn't know prior until I contacted them, Brownells was excellent for getting these to me quickly.
Would you recommend this? Yes, I would recommend to a friend
by JAMES OWEN on December 05, 2025
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5
Good Tube. Great Price.
Good fit is a good buffer tube. It was an Easy install and it worked well with a Magpul MOE stock. Great Price.
Would you recommend this? Yes, I would recommend to a friend
by Samuel Pierson on July 25, 2025
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5
6 position Mil spec M4 buffer tube
First my PSA made blade with no problems. Threads are good no stripping. Anodizing is no blemish. Good quality, for the price.
by CHRISTOPHER JOHNSON on June 08, 2025
Verified Purchase
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5
Six position
They look good.
by HARRY DE LEON on February 24, 2025
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5
Fits the bill
Is what it says it is. Would purchase again
Would you recommend this? Yes, I would recommend to a friend
by Jason Baker on October 27, 2024
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5
Buffer Tube
This is perfect. Keep in mind this is only the tube.
Would you recommend this? Yes, I would recommend to a friend
by Robert Mountney on September 27, 2024
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5
Excellent buy
Gave the tube a once over and the finish is excellent. Checked the size, diameter, and like my buddy would say, "Spot on". Installed in Bushmaster M4 and fit was fine. PRS stock fit was good.
by MONTE MORAST on September 25, 2023
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