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Heckler & Koch (HK) High-Reliability Steel Magazine

5.56mm NATO, 30-Round Capacity

NSN 1005-01-520-5992 ("Maritime/Anti-corrosion") (More Commonly Used),

NSN 1005-99-126-9781 ("Anti-friction") (Less Common)

The following information was taken from the official HK data sheet for the High-Reliability 30-round Magazine

A weapon system is only as reliable as the feed device.   Current available aluminum and polymer magazines for M16-style weapons have long been the weak link in the reliable performance of these weapons. This remains true with today’s offerings of military-issue magazines and those from aftermarket sources. Now, HK offers the solution to this problem.  Considered by users in elite US military and law enforcement units as the best and most reliable M16-style magazine in the world, the new Heckler & Koch High-Reliability 30-Round Steel Magazine is designed for use in any U.S. M16/M4/AR15-style rifle, and any weapon that utilizes this NATO standard magazine.  Originally developed by HK for the British L85 (SA80) & L86 weapons, this curved 30-round magazine provides a substantial improvement (30-50%) during extensive reliability and durability testing.  The superior function of the magazine was validated during three separate tests of the L85/L86 with the British MoD in arctic, jungle, and desert environments during the firing of more than 1/2 million rounds.

The HK High-Reliability 30-Round Steel Magazine features a well executed design, select materials, special anti-friction surface finish, advanced spring material, attention to production tolerances, and steel magazine housing and follower. HK also offers this magazine with a proprietary HK “Maritime” anticorrosion coating and in a 20-round capacity.  Affordable and uncompromising in its execution, the HK High-Reliability 30-Round Steel Magazine is available to military units and law enforcement agencies.

Specifications:

Length: 7.48 inches (190 mm)
Width: .94 inches (20 mm)
Height: 2.56 inches (165 mm)
Weight (empty): .54 lb. (.25 kg)
National Stock Numbers (NSN): 1005-99-126-9781 (Anti-friction)
1005-01-520-5992 (Maritime/Anti-corrosion)
HK Part Numbers: 209472 (Anti-friction)
251770 (Maritime/Anti-corrosion)