My kahr CW9 has a nick on one of the thin steel rails molded into the frame. Both rails also look a little worn. Also the frame and slide do not seem to be tight and when I slowly pull the trigger I can see the slide lifting up away from the frame a little at the end of the barrel. Are any or these things a reason to be concerned? I have never had a Kahr before and I bought it used but I can return it.Thanks for any input.