Calibers: 5.56x45mm or 300 BLK. Capacity: 10- or 30-round magazine. Barrel: 7.5”. Grip: A2-style. Sights: Steel fixed front and rear. Length: 19.75”. overall. Weight: 5.65 lb. unloaded. Finish: black or FDE. Features: short-stroke gas piston, non-reciprocating charging handle.