I just picked up a p938. This little gun is a tough one to re-assemble. I finally had to watch a video to see what the heck the problem was. The guide rod would stick out after re-assembly, I'd pull it apart and rinse and repeat, same issue. Then I watched a video about pushing the barrel down. Now I need 3 hands, hold the ejector down, hold the barrel down, hold the slide back and then insert the pin. Maybe it gets easier after a few times.