I am working on a very early stevens 520 12ga pump, short barrel and the shell stop is very worn. Usually let’s the shells eject out the bottom. Any one have one of these problems on a old 520 ? I hesitate trying to peen it to enlarge it, don’t think I can solder any thing on it. Easiest I think would be to braze a blob and file to fit but I hate seeing brass in a guns innards. Maybe I need to break down and get a tig welder, as I really would like to have one. Parts for this thing I am sure a none existent. Any ideas?