The TacFire 5 7.62x39mm Complete Upper Assembly is an ultra-compact, high-performance solution designed for specialized AR-platform builds. It features a 5 4150 steel barrel with a 1:10 twist and a Black Nitride finish for superior durability and corrosion resistance. The muzzle is equipped with a standard 5/8x24 thread pattern and an A2 flash hider. This plug-and-play unit comes fully assembled and includes a 7.62x39mm bolt carrier group (BCG), making it ready to pin onto any standard AR-15 lower receiver configured for this caliber. Note: This 5-inch assembly is intended for pistol or SBR (Short Barreled Rifle) configurations.