CALIBER:.300 AAC BLACKOUT, UPPER RECEIVER:FORGED A4, BARREL:16-INCH CHROME MOLY, 1:8 TWIST, MUZZLE DEVICE:SMITH VORTEX FLASH HIDER / 5/824 THREAD, GAS BLOCK:LOW PROFLE GAS BLOCK, HANDGUARD:RRA 12.5 INCH LIGHTWEIGHT FREE FLOAT RAIL, M-LOK COMPATIBLE, INCLUDES:BOLT CARRIER GROUP AND CHARGING HANDLE ASSEMBLY