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.