I bought a c9 about 6 years ago from my local pawn shop, shot about 20 rounds, and put it in a drawer. I now live very close to a range, so I took it out today to clean it. There is no slide retainer pin. I assume that this an unsafe condition. I'm about to start browsing the web for the part, but wanted to see if I could get a recommended source from you guys. While I'm at it, if the mag is full, the 1st round won't chamber. Is this a known issue or is it a problem?