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BRN AR-15 Bolt Carrier Gas Key, Black
BRN AR-15 Bolt Carrier Gas Key, Black
BRN AR-15 Bolt Carrier Gas Key, Black
BRN AR-15 Bolt Carrier Gas Key, Black
BRN AR-15 Bolt Carrier Gas Key, Black
BRN AR-15 Bolt Carrier Gas Key, Black
BRN AR-15 Bolt Carrier Gas Key, Black
BRN AR-15 Bolt Carrier Gas Key, Black
BRN AR-15 Bolt Carrier Gas Key, Black
BRN AR-15 Bolt Carrier Gas Key, Black
None
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BROWNELLS - BRN AR-15 Bolt Carrier Gas Key, Black

9 Reviews
BRN AR-15 Bolt Carrier Gas Key, Black
Brownells #
100040949
MFR #
AZT-M4-556ST012
UPC
050806029545
$28.99
Coupon Code
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Specifications
Make Model Fit:
AR-15.Universal
Restriction
Gun Part Restrictions:
Yes
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International purchase information

What is the BROWNELLS - BRN AR-15 Bolt Carrier Gas Key, Black?
OEM replacement AR-15/M16 Bolt Carrier Gas Key.

See all of our AR15s and AR15 parts here.

Gun Part Restriction
Gun Parts have restricted shipping to CA.

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AR-15 BOLT CARRIER GAS KEY REVIEWS

4.8
9 Reviews
5 Stars
78%
4 Stars
22%
3 Stars
0%
2 Stars
0%
1 Stars
0%
Reviews Summary
Overall, the AR-15 bolt carrier gas key receives praise for its quality and ease of installation. Reviewers appreciate its performance and recommend pay attention to proper mounting procedures. Some confusion arose around whether the key is chrome-lined or nitrided, but most agree it performs well as a spare or for builds. Shipping and product specifications were noted, with some reviewers expecting more clarity from the vendor.
What Reviewers Are Saying
Product Quality
75%
Reviewers consistently express satisfaction with the quality of the AR-15 bolt carrier gas key, noting that it meets specifications and functions correctly post-installation. Many users find it to be high-quality and ideal for various applications, whether as a spare or for new builds.
Installation Experience
60%
The ease of installation is highlighted across multiple reviews, with users reporting no fitting issues. However, reviewers emphasize the importance of using proper techniques, such as using new screws and adequately staking them to avoid misalignment.
Product Specifications
50%
There is some confusion regarding the specifications of the gas key, specifically whether it is chrome-lined or nitrided. Some reviewers appreciate the nitrided key for its performance, while others were initially misled about the product being chrome-lined, highlighting a need for clear product descriptions.
Shipping Experience
20%
A few reviews mention timely delivery, but there are uncertainties regarding shipping costs, which some feel are excessive. Clarity on pricing might improve the overall customer experience.
Customer Support
30%
Some reviewers refer to interactions with Brownells customer support, noting that while they were able to address concerns regarding specifications, accurate product information is critical, as misinformation can lead to confusion among customers.
5
Bruce
Perfect
by BRUCE HINTZEN on October 07, 2025
Verified Purchase
Was this review helpful? 1
5
It does what is it supposed to do.
I used this with the Brownell’s video telling me how to put it on, and it works just fine.
by JAMES ROBINSON on September 20, 2025
Verified Purchase
Was this review helpful? 0
5
AR-15 BOLT CARRIER GAS KEY
Works well. No problems mounting. Working well so far.
by DANIEL E TACKITT on May 18, 2024
Verified Purchase
Was this review helpful? 0
5
great quality
This is a spare for on a bolt carrier I only use for completing upper builds. But it's also my ready spare because it's much higher quality than I needed!
by Jon Cryor on October 28, 2023
Verified Purchase
Was this review helpful? 0
5
Excellent Nitrided Part
If you're looking for a nitrided key, then this one is good to go. It is not chrome-lined. Given that it is nitrided, it will definitely gall that bolts that your staking fixture uses so be prepared for that. My Brownells key spec'd out to 0.1815" internal diameter (which passes the 0.1820" NoGo specification). I true'd up 3 of these keys using 400 grit and am happy to report that all 3 of them were already pretty darn close to perfect already. Make sure to clean the mating surfaces with brake cleaner and then use Loctite 620 on the mating surface. Definitely use new bolts with a little bit of red loctite (preferably OCKS bolts) torqued to 58 in-lbs and stake them with a good tool (M-Guns or Brownells).
by TJ on December 06, 2021
Was this review helpful? 7
View All 9 Reviews
Customer Questions
5 Questions