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.Caliber: 5.56x45mm NATOCapacity: 30rdFinish: BlackModel: MR556Material: SteelType: DetachableModel Fit: MR556Brand Fit: H&KCapacity: 30