This package is for Mac-10 .45 acp owners that want to save some money and shoot 9mm rounds with a monster magazine. This combo comes complete with a Cobray 9mm magazine well converter, a Mac-10 9mm single feed complete bolt assembly, and one of our 9mm 30 round steel magazines. Please call if you have any questions.BOLTS ARE BACK ORDER ONLY-AVAILABLE FALL 2017
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