HK AR15 30rd Steel Magazines. The HK High-Reliability 30rd Steel Magazine is the Mercedes of AR-15 magazines! It has a well executed design, special attention to production tolerances, a steel magazine housing and follower and a proprietary HK "Maritime" anticossosion coating. It is considered by users in elite US military and law enforcement units as the best AR-15/M-16/M4 magazine in the world. In US military testing, the HK magazine improved feeding reliability by 30-50% overall. The Maritime coating easily surpasses the US MIL-STD-810 E salt fog test. During this test the magazines were exposed to a 100 hour salt fog and then stored three days at ambient temperature. After this procedure each magazine was fully loaded and fired twice with no problems. The superior function was validated during three separate tests by the British MoD in arctic, jungle, and desert environments during the firing of more than 1/2 million rounds. *Note: This magazine has the following markings: 5.56 x 45 Restricted Law Enforcement/Government Use Only 10-94; Heckler & Kock GmbH - Made in Germancy; Heckler & Koch Inc. - Sterling VA. Restrictions are observed in the following cities and/or states prohibiting the sale or shipment of magazines with more than a 10rd capacity to: Aurora, Il; Chicago, Il; Cook County, Il; Cincinnati, OH; Columbus, OH; Toledo, OH; South Bend, IN; All of CA; All of CT; All of HI; All of MA; All of NJ; All of NY, MD