One thing about something thread it does have a chance to go in cockeyed. I don't think it's worth tapping the h.p. first. Maybe if you go the bb or bearing route a little white glue to hold it in place instead of crimping it?That's a good idea. One thing I like better about the screw idea is that it's threaded on, so it's secure when cycling/being shot. I'm thinking if that BB were to rollout and get pinched between the slug and barrel, it could wreak havoc on the rifling.
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