Caliber: 5.56mm/.223. Capacities: 30 rounds. AR-type rifles and carbines offered with the BFSIII Binary Trigger. Barrel: 16 in., LTW Contour, 1:7 RH twist, A2 muzzle device. Stock: M4. Sights: Optics ready, 12 o’clock full-length Picatinny rail. Weight: NA. Trigger: BFS III Binary Trigger. Overall Length: 32.5 to 35.5 in. Features: Standard charging handle, low-profile gas block, 15-in. FST Handguard/Upper, salt bath nitride bolt carrier, A2 Grip. FAI-15 lower.