I have a new Shield and I can manually lock the slide back just fine and easy . I disassembled it to clean it and all was fine. I then disassembled it again and couldnt push the slide far back enough to lock the slide to get the disassembly lever ( on the slide of the frame) back up. After repositioning the recoild spring many times I finally got it to where the slide would go back enough to lock back. BUT EACH TIME I PUT IN THE RECOIL SPRING , IT WAS CORRECTLY INSTALLED. Do any of you know what could have caused this ? At my job a few weeks ago , I had to go get this persons pistol and make it safe until we completed a task. The pistol was a Shield. When I tried to lock back the slide on it , it too would not lock back all the way enough to catch the slide lock. I was pushing hard and it seemed liek it was far back enough that it was bottoming out the recoil spring but just wouldnt lock. It's wierd that it happened to me with my Shield and someone elses. Any thoughts or experiences similar to this ?