CALIBER5.56 NATO - BARREL 16 1:8 Twist - WEIGHT 6 lbs. - UPPER RECEIVER Forged 7075 T6 Aluminum Type 3 Hard Anodized Black - LOWER RECEIVER Forged 7075 T6 Aluminum Type 3 Hard Anodized Black - HAND GUARD 6 A2 Plastic - THREAD PATTERN 1/2 - 28 - MUZZLE DEVICE A2 Flash Hider - GAS BLOCK .750 Diameter - GAS SYSTEM High Rise Carbine Length - BUTTSTOCK 6 Position Carbine Buttstock - BUFFER TUBE 6 Position Buffer Tube - BOLT CARRIER Standard M16 Profile - CHARGING HANDLE Standard - PISTOL GRIP A2 Style - SAFETY Ambidextrous