I have a S&W model 1500 long action that I have been doing some work to It and I would like to put a detachable magazine in it.. Do you guys know if they make such a thing in metal? I have seen the plastic ones on legacy and from weatherby.. Most BM's I have found are only for short actions. Any ideas? Does anyone have one of the polymer bottom metal kits? If so, what's the quality if them? Thanks