Welcome (back). First of all, take it apart and clean it. I've purchased some that were so cruded up, the bolt wouldn't lock back. As far as the unintended discharge, one thing I can think of is that the firing pin stayed forward due to crud. The action can be taken all the way apart. There are some YouTube videos on it. So my best advice is to completely disassemble and clean it. It looks in good shape, nice squirrel stock and a vintage scope. It can be fixed.