Well, I'm not sure. There is nothing under the slide that should stop the clip from going fully up. The only thing I can think of is the magazine catch being bent, or something similar. Generally, that is something you never see happen. You might want to check the catch pin, and make sure it isn't broke, allowing the magazine catch to skew sideways in the slot in the frame, or bind with the magazine safety lever. There's four parts in all, the magazine catch, its pin, and spring, and the safety lever it actuates on the right side.
One last thing you might check, is to make sure the extractor pin is inserted up into the bolt portion of the slide, and not hanging down under where it might hit something. That is the only thing that I remember being movable in that direction.
Last edited by Dixie Gunsmithing; June 24, 2013 at 07:09 PM.