CALIBER:.450 BUSHMASTER. LOWER RECEIVER:FORGED RRA LAR-15M. UPPER RECEIVER:FORGED A4. GAS SYSTEM:MID-LENGTH GAS SYSTEM. GAS BLOCK:LOW PROFILE GAS BLOCK. BARREL:16-INCH STAINLESS STEEL, 1:24 TWIST, CRYOGENICALLY TREATED. MUZZLE DEVICE:RRA OPERATOR BRAKE, 5/8-32 THREAD. TRIGGER:RRA TWO-STAGE ULTRA MATCH TRIGGER. TRIGGER GUARD:RRA WINTER TRIGGER GUARD. SAFETY SELECTOR:STAR SAFETY. HANDGUARD:RRA 13 INCH EXTENDED LIGHTWEIGHT FREE FLOAT RAIL, M-LOK COMPATIBLE. BUTTSTOCK:RRA OPERATOR CAR STOCK. PISTOL GRIP:HOGUE RUBBER GRIP. WEIGHT:6.8 POUNDS. LENGTH:34.5 INCHES RETRACTED. ACCURACY:1 MOA AT 100 YARDS. INCLUDES:ONE 5 ROUND MAGAZINE, RRA CASE.