I am a new member to The Firing Line and need help with a Stevens O/U 22/410 that I have received from my dad. I've read the information from a 2006 thread but I have not found anything related to my gun which has a "plastic" stock and fore end and a opening on the right side of the receiver indicating that the gun had a selector switch which is clearly gone. The hammer does have what seems to be a selector so I'm thinking the gun has been retrofitted. I put a spent 22 shell in the receiver and the firing pin left barely a mark so I'm guessing the firing pins are worn or the springs are worn out. Any information would be greatly appreciated. I've shopped gun shows for several years for a 22/410 O/U and now that I have one I'd sure like to make it servicable. Thanks for any help.