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If you’re looking for a solid bolt carrier with a little more weight, the Fail Zero M16 bolt carrier is a great mod for your AR15 rifle. This is a completely assembled, ready-to-install M16/4 bolt and carrier system. This kit includes six critical parts that are treated with EXO technology and a revolutionary surface technology that provides permanent dry lubricity. It radically improves the performance of your M16/4 and eliminates the need to apply oil or grease to treated parts for the life of the weapon. All Fail Zero bolts are MPI tested and live fire tested. They do not do HPT, as they feel live fire is a better test.Treated Parts Include