So I just joined this forum (maybe an hour ago), and I am already in trouble. I recently acquired a P90. The gun was dirty and needed to be field stripped for cleaning. I thought I was following the correct procedure based on a video and the Ruger manual. When reassembling the pistol, the slide became stuck and will not move back or forward. I'm thinking the ejector is at issue. Any thoughts? I'm totally new to this pistol, but far from being new to handguns. thanks for your help.