Designed to provide optimum ammunition feeding for any M16/M4/AR15-type weapon the Heckler & Koch 30-Round Steel Magazine can be used in any firearm that uses a NATO-standard 5.56 mm magazine. Originally developed by HK for the British L85 (SA80) & L86 weapons this curved 30-round magazine has been combat-proven by U.S. special operations forces and foreign military units. The 30-Round Steel Magazine features a well-executed design; select materials special anti-friction maritime surface finish advanced spring material attention to production tolerance and steel magazine housing and follower. Length: 7.48 inches (190 mm) Width: .94 inches (20 mm) Height: 2.56 inches (165 mm) Weight (empty): .54 lb. (.25 kg)