Caliber: 5.56mm NATO. Capacity: 10-round magazine. Weight: 51 oz. Sights: Rear sight adjustable for windage, front sight is M-16 blade. Barrel: 9.2”. Length: 18.5”. Features: Muzzle is threaded 1/2x28 to accept standard attachments such as a muzzle brake. Except for the barrel, bolt, sights and mechanism, the PLR16 pistol is made of high-impact glass fiber reinforced polymer. Gas-operated semi-auto. Black, tan or green finish. Conventional gas-piston operation with M-16 breech locking system. MIL-STD-1913 Picatinny rail. Made in USA.