Manufactured in the United States using premium components, the BRN-15 upper receiver groups serve as an excellent foundation for your next build. To complete the assembly, select your preferred Bolt carrier group and charging handle. The BRN-15 upper receiver groups are equipped with a 5.56x45mm chambered barrel featuring a nitride finish, available in various popular lengths. Each barrel includes a gas block dimple, ensuring secure engagement with the rear gas block screw. All barrels undergo stress relief processes. The distinctive M-LOK handguard extends beyond the gas block, maximizing usable space. Anti-rotation tabs at the rear of the handguard engage with the upper receiver maintaining alignment with the receiver's picatinny rail. Dual large screws clamp through the properly torqued barrel nut, preventing forward slippage of the handguard. Additionally, large vents positioned towards the rear facilitate rapid cooling of both the barrel and handguard.

4150 chrome moly vanadium (CMV) barrel
5.56x45mm Caliber
1:7 rifling twist rate
Thread specification - 1/2-28 muzzle
A2 flash suppressor
7075-T6 forged upper receivers
Anodized upper receiver with hardcoat finish
M4 feedramps in upper receiver and barrel extension
Barrels are designated as 5.56x45mm, 1:7 twist, 4150CMV SR
Manufactured entirely in the United States

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All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.

Brownells BRN-15 11.50" Railed Upper 5.56x45mm 1:7 Carbine-Length no BCG&CH, Black