The AM-9 PCC Complete Upper hosts a 16'' barrel with a 1:10 twist covered by a 12'' MLOK Handguard and capped off by a Knight Stalker Muzzle Device. This upper includes BCG and charging handle.Specifications and Features: CALIBER: 9MM UPPER RECEIVER MATERIAL: Forged 7075 T6 Aluminum RECEIVER FINISH: Type 3 Hard Anodized, Black 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: Standard TWIST RATE: 1:10 CHARGING HANDLE: Standard Charging Handle HANDGUARD: M-Lok