I have an old single shot. The only thing written on it is EXCEL and a serial number. I was told it isn't worth much. Which I am fine with. I have no real use for it. I was thinking of using it for slugs. Would you guys think it would be worth it to get it tapped for a shotgun scope? If so how much you think it would cost to get tapped?Do you guys think it could handle slugs. It seems to be in good working condition. I still have to test it out.