Anderson AM-15 Forged AR Rifle - Black | 5.56NATO | 16" Barrel | 12" M-LOK Rail | Hold Tite Muzzle Device 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 Open 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 1:8 GAS SYSTEM LENGTH Carbine Length GAS SYSTEM TYPE Low Profile GAS BLOCK DIAMETER .750 inch CHARGING HANDLE Standard Charging Handle BOLT CARRIER GROUP Standard M16 Profile HAND GUARD TYPE M-Lok HANDGUARD M-Lok HAND GUARD LENGTH 12 inches PISTOL GRIP A2 Style THREAD PATTERN 1/2 - 28 MUZZLE DEVICE Knight Stalker Flash Hider BUFFER TUBE 6 Position Buffer Tube BUTT STOCK/BRACE 6 Position Carbine Butt stock.