I have a McMillian a5 stock, it is inletted for bdl bottom metal, as a result I didn't want to reinlett my stock, so I ordered ptg drop in bottom metal...but it don't drop in ...anyone else have this problem, it looks like the bottom metal is hitting the stock inbetween the trigger hole part of the stock and the mag part...is it ok to mill this away and have no problems with the structural integrity?