WEIGHT 8.000000 LOWER RECEIVER MATERIAL Forged 7075 T6 Aluminum UPPER RECEIVER MATERIAL Forged 7075 T6 Aluminum UPPER RECEIVER FINISH Type 3 Hard Anodized - Black LOWER RECEIVER FINISH Type 3 Hard Anodized - Black TRIGGER GUARD Closed Trigger RF-85 TREATED Non-treated BOLT CARRIER FINISH Nitride BOLT CARRIER MATERIAL 8620 Steel BOLT FINISH Nitride BOLT MATERIAL 9310 Steel BARREL MATERIAL 4150 Chrome Moly Vanadium BARREL LENGTH 16 inches BARREL FINISH Nitride BARREL CONTOUR Government Profile TWIST RATE 1:10 GAS SYSTEM LENGTH Mid Length GAS SYSTEM TYPE Low Profile GAS BLOCK DIAMETER .750 inch CHARGING HANDLE Standard Charging Handle HAND GUARD TYPE M-Lok HAND GUARD LENGTH 15 inches PISTOL GRIP Magpul K2 THREAD PATTERN 5/8 - 24 MUZZLE DEVICE A2 Flash Hider BUFFER TUBE 6 Position Buffer Tube BUTT STOCK/BRACE Magpul