18 416 SST Barrel (1:7 Twist) – .750 Rifle-Length Gas System – Diamond-Honed Nitride M16 BCG (6.5 Grendel Bolt Face) – APF 3.5 lb. Drop-In Trigger – APF Adjustable Gas Block – APF Butcher-16 Muzzle Break – Magpul ACS Stock – Magpul MOE Grip – APF 15 M-Lok Handguard – Billet Receiver Set – Ambidextrous Controls – Caliber/ Gauge: 22 Arc – Barrel Length: 18 416 SST Barrel (1:7 Twist) – Action: Semi-Auto – Front Sight: Rear Sight: None – Color: White – Finish: Cerakote – Material: Aluminum – Hand: Right