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BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
BRN-4 Stripped Upper Receiver Billet
None
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BROWNELLS - BRN-4 Stripped Upper Receiver Billet

20 Reviews
BRN-4 Stripped Upper Receiver Billet
Brownells #
430104365
MFR #
BRN4UPPER
UPC
810110360228
$249.99
Coupon Code
Purchase Limit Help

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Specifications
Cartridge:
223 Remington,5.56x45 NATO
Item Weight (lbs):
0.550
Item Height (Inches):
2.500
Item Length (Inches):
8.063
Item Width (Inches):
2.063
Color:
Black
Material:
Aluminum
Make Model Fit:
Brownells.BRN-4;Heckler & Koch.416;Heckler & Koch.MR556
Finish:
Anodized
Hand:
Right
Model Number:
BRN-4
Quantity:
1
Receiver Style:
Stripped
Restriction
Restricted Part:
Yes
Prop 65 restriction:
Warning: Cancer and Reproductive Harm-www.p65warnings.ca.gov
View US State Restrictions
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How To Buy Guns Online

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What is the BROWNELLS - BRN-4 Stripped Upper Receiver Billet?
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.

Restricted Part
Please check with your state regulations for ownership of Restricted Parts. May require documentation.

Prop 65WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov

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BRN-4 STRIPPED UPPER RECEIVER BILLET REVIEWS

3.6
20 Reviews
5 Stars
30%
4 Stars
25%
3 Stars
30%
2 Stars
5%
1 Stars
10%
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.
5
Quality improved?
While I haven't had the privilege to fire mine yet, the quality of this upper of a better than expected quality given the price and niche. Plus, its got that sexy 416 height, you just can't get that anywhere else
Would you recommend this? Yes, I would recommend to a friend
by Brian on July 30, 2025
Verified Purchase
Was this review helpful? 0
5
Nice upper!
Great, I missed the sale by two days, but it is still great!
Would you recommend this? Yes, I would recommend to a friend
by DANIEL SUMMERHILL on August 02, 2024
Verified Purchase
Was this review helpful? 0
5
Not sure what the big deal is
All the low review ratings on here talk about how bad the machine marks are, but in reality, they're barely noticeable, and even if they do look rough, they don't even catch a fingernail. The finish is very nice, and when assembled, the action is very smooth.
by COLIN ZIMMERMAN on November 22, 2023
Verified Purchase
Was this review helpful? 2
5
Well Built
Impressed with the quality and tolerances with this product. 100% interchangeable with HK 416 or MR556 build projects.
by JOEL BRISKE on October 24, 2023
Verified Purchase
Was this review helpful? 2
5
Update
Finish and fit this time was great. Received replacement upper receiver, no defects matched up perfectly. I’m happy with the product. Customer service was the best during this process
by Michael S. on May 05, 2023
Verified Purchase
Was this review helpful? 5
View All 20 Reviews
Customer Questions
0 Questions