Brigade Manufacturing BM-300 AR-15 .300 Blackout 7.5-Inch Complete Upper – Forged Receiver

The Brigade Manufacturing BM-300 AR-15 .300 Blackout Complete Upper Forged Receiver built for accuracy, reliability, and endurance. Designed with a gas-impingement operating system, it delivers proven reliability backed by a long track record of performance. The .300 Blackout cartridge is renowned for its excellent suppressed capabilities; when paired with subsonic ammunition and a suppressor, it produces significantly reduced report and softer recoil.

This Forged MIL-SPEC upper receiver is compatible with any MIL-SPEC lower receiver, perfect for AR builds with suppressor setups. The short 7.5-inch .300 Blackout configuration provides a balance of comfort in a compact length and is ideal for tight-space operation, including CQB environments, home defense, travel, and camping.

Materials

• Receiver: 7075-T6 Aluminum Forging (MILSPEC)
• Barrel: 4150 V
• Barrel Finish: Nitride

Features

• Platform: AR-15
• Caliber: 300 Blackout 
• Finish: Cerakote
• Rail: Free Float, U-LOK
• Rail Length: 7 inch
• Barrel Length: 7.5 inch
• Barrel Twist: 1:7
• Barrel Extension: M4
• Barrel Thread: 5/8x24
• Muzzle Device: A2 Flash Hider, Bird cage 
• Bolt Carrier Group: *Not included*
• Charging Handle: *Not included*

Operating System

• Gas Impingement