The Carbine features a full-length piston driven gas system, fully adjustable gas regulator, and sand cut bolt carrier. Barrel Length: 18" Caliber: 7.62×51 Capacity: 20+1 Length: 37.5" Stock: Polymer Weight: 8.35 lbs. The SA58 FAL has a fixed humpback style stock with a durable Matte Black DuraCoat finish. The DS Arms SA58 FAL Rifles, The Best Battle Rifles Bar None. Mfg: D.S. Arms