Can someone tell me (detailed description) how to check barrel to slide lockup on a Sig. I have no clue what to look for and how to do it. And also do sigs have a lot of horizontal and vertical play in their slides? Mine does. And when I rack and lock the slide back should I be able to wiggle the recoil rod as it sticks out the muzzle end. I can wiggle it a lot and it even moves the slide up and down when I move the recoil rod up and down. I just want to know because it was a CPO sig that I bought a little over 2 months ago and need to know if I got screwed on the deal. If so, then I'm gonna sell it. I hate to part with it though because I love how it looks. It's a sig P226 elite. Oh yeah and one other thing. There's only one location of the serial number on it. That is on the frame. Is that normal? Usually they put the serial number on the slide and barrel too right?????