Radical Firearms (RF) Rifle Upper – .300 AAC Blackout, 16" Barrel (1:8 Twist)
This Radical Firearms AR-15 pattern rifle upper is chambered in .300 AAC Blackout (7.62x35mm) with a 16" barrel marked “300 BLK 1/8” for a 1:8 twist rate. It features a flat-top upper receiver and a free-float handguard with a continuous Picatinny top rail.
A muzzle device is installed at the threaded muzzle, and the handguard provides multiple slots for accessory mounting and ventilation.