Brownells BRN-180S Gen 2 complete upper receiver assembly chambered in 300 AAC Blackout. Built around a 10-inch barrel with 1:8 twist and 5/8-24 muzzle threads, this anodized upper is designed to drop into the BRN-180 platform for a ready-to-run 300 BLK build.
Key Features
Complete upper receiver assembly for the BRN-180 Gen 2 platform
Chambered in 300 AAC Blackout
10-inch barrel with 1:8 twist for flexible projectile stabilization
5/8-24 muzzle threading for common suppressor and muzzle device compatibility
Anodized aluminum upper receiver for durability and corrosion resistance
Finish your BRN-180 build with a complete 300 AAC Blackout upper receiver assembly designed for straightforward installation.
