I had lots of issues with the skinny barrel stock. It was one of the first stock they produced for the Bmag. The mag is still a pain it the butt to get locked in. The stock for the heavy barrel fit pretty well, but if I remember correctly the safety was a little tight. It's been a while and I've work on numerous rifles and stocks since then, so I honestly don't remember what caused the interference or how I corrected it. Sorry I couldn't be more help.
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