I shot my PT145 for the first time today. It shot great, a little low but at 60' under 3' pattern, off-hand. I just started to disassemble it and the slide is locked up hard. Mag is out, gun is empty. I pulled the slide back and removed the takedown pin. I got the slide forward to near battery as I pulled the trigger and about 1/8th" forward of battery and it's locked up hard as a rock. It won't move forward or back. Hmmmmm??? Any suggestions?