Went to the range today and shot my P3AT and when I got home tore it down to clean it. Not sure what happened but when I went to put it back together the upper assembly would not slide back on the frame past the rear of the frame. In other words it would not cock and I couldn't get the holding pin back into place. I took it apart and re-tried it several times to no avail. Anybody got any ideas? This is my "don't leave home without it" gun and I will feel naked until it is back in my pocket. I only live about 30 miles from the factory but hate to drive up there if it is something simple that I have done or not done.