The AR Bracket is designed to mount directly to the Magpul CTR stocks. Once the AR bracket is bolted on the Rail Mounted ABR with the longer dowel option will attach to the new bracket. It ships with all supplied hardware for mounting. It weighs 2.4oz - bracket , bolts and nuts. Made from 6061 alum with class II anodizing (American Alum , machined and anodized in the USA) Newer MOE have a shorter slot in a lower location and the AR Bracket will not work. Direct Bolt on Applications: Magpul CTR