Hello, I have recently acquired a 40 jcp used. It didn't have a mag so I just bought a new one but its giving me some fits. Any advice on that? Then I went to disassemble and clean it but possibly found a crack in the frame right behind the doll head close to the seam in between the two grips. Should I call mom or is something to even worry about? BTW its an older style JCP with no guide rod (or maybe its just missing?) and a drilled trigger instead of slotted Thanks a million!!