The used JCP that I bought on GunBroker was delivered today. It looks new...in the original box, original papers in their zip lock bags, laser is very bright and the lock looks untouched. So... I go to lock back the slide and it doesn't lock back. Not only does the LRHO not work but the slide doesn't move rearward far enough to engage the safety to hold it open. The slide makes a strange spring sound. Without being able to move the slide all the way back, I'm not sure if I can even take it apart to see what's wrong. This is my first and only HP pistol so before I make things worse, I thought I'd check-in here and see if anyone knows what I'm up against here. Oh yeah, and I hear and see something rattling/moving around up inside the handle. It might be the slide retainer??? Any help is appreciated.