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BRN-4 STRIPPED UPPER RECEIVER BILLET

BRN-4 STRIPPED UPPER RECEIVER BILLET Reviews & Ratings

Assemble your own BRN-4 Upper Receiver Assembly

Machined from billet aluminum the new BRN-4 Stripped Upper Receiver mates perfectly with the Brownells BRN-4 barrels, gas system components and bolt carrier group. Assemble a BRN-4 Upper Receiver Group from all new parts, no more relying on surplus, used components. Precision machining of the billet aluminum gives the appearance of a forged part, with finely mapped contours, leaving no unecessary flat surfaces or sharp edges.

Matte black hardcoat anodizing. Anodizing meets or exceeds mil-spec requirements for thickness. Laser engraved T-Marks and BRN-4 logo.

Fits standard AR-15 & M16 Lower Receivers. Accepts standard AR-15 & M16 ejection port covers and forward assists. Does not include Op Rod / Upper Receiver Bushing (sold seperately).

Requires BRN-4 Upper Receiver Bushing (078000700)

Compatible with early style, HK® 416 (A1-A3) barrels and barrel nuts.

PLEASE NOTE: This is a Billet Receiver, machined from a solid block of aluminum. As a result, it will show machine passes on some of the more complex geometry. These are intended to retain the overall exterior dimensions of a forged part. These surfaces are prepped by bead blasting to reduce the profile of any machining prior to anodizing.

See all of our AR15s and AR15 parts here.

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25%
3 Stars
30%
2 Stars
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1 Stars
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Reviews Summary
The BRN-4 Stripped Upper Receiver Billet offers good performance and fits a budget, but many users report quality control concerns, primarily with machining and fit issues. Customer service is praised, especially regarding returns and replacements. Overall, while some are satisfied, others caution it may not meet the quality of genuine HK parts.
What Reviewers Are Saying
Product Quality
65%
Many reviewers note quality concerns, particularly regarding machining marks, anodizing thickness, and fit specifications. Some received out-of-spec products that affected compatibility with other parts, while others encountered only minor issues. Despite these concerns, most agree the product functions well within its intended purpose.
Customer Service
70%
The customer service experience has received positive feedback, with users highlighting helpfulness during the returns and exchange processes. Many reported prompt responses and resolutions to issues, which adds to overall customer satisfaction despite initial product problems.
Fitment Issues
55%
Fitment problems, such as loose fitting with parts and alignment issues, are frequently mentioned. Reviewers noted that the upper receiver often does not align properly with lowers or other components, leading to potential operational issues.
Value for Money
50%
Consumers generally feel that the BRN-4 upper receiver offers decent value considering its lower price compared to original HK parts. However, some feel that the discrepancies in quality may warrant buying higher-end products instead.
Aesthetic Concerns
45%
Several reviews mention the upper's aesthetic quality, particularly the visible machining marks and the anodizing finish. While some users accept these imperfections as expected from a budget option, they still dampen the overall perception of quality.
2
Alignment issue
The barrel indexing notch is off center causing the barrel to be clocked wrong in the receiver to the point where the bolt would hit the barrel and not close at all. So I tried the second barrel I ordered and I could get the bolt to seat right but I couldn't get it out again without removing the barrel from the receiver. Apart from that the notch that keeps the handguard in line is to wide causing the handguard to be able to rotate. The finish was really nice though and I couldn't have been happier with it, I just wish the fitment was better.
by Matt on June 12, 2023
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