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I bought this Radical bolt carrier and used it with the Radical Firearms 7.62x39 upper, the 16 inches barrel one, and worked pretty well. Before shooting it I replaced the firing pin with a reinforced pin for 7.62x39 made by Bexar Arms and I didn't have any malfunction. I used an ASC 7.62x39 magazine for my lower M&P 15 AR. I'm very happy with the results.
Great upper . I used it to build an AR 15 in 7.62x39 in an M&P 15 lower. I just tried it at the range and worked flawless. I'm using a Radical Firearms bolt carrier with an enhanced 7.62x39 Bexar Arms firing pin which I got to replace the original firing pin. I used a 20 rounds ASC magazine and 124gr cheap ammo.very happy with the results.
Great for the price . I tried in an AR 15 upper I built with a Radical Firearms 7.62x39 upper and worked flawless. I'm using a twenty rounds ASC magazine and a Bexar Arms 7.62x39 enhanced firing pin in a M&P 15 AR 15 lower