I have a Full size Springfield XD9 pistol, I took out the firing pin to clean it last night and am now unable to reinstall firing pin. It appears that a roll pin is blocking the way but nothing is moving inside the slide. The pin will go about halfway and stop. Has anyone else had this issue? The pin just fell out when I turned the slide on end to remove it with no resistance at all. Firing pin is not bent and I cannot even see through the slide where the firing pin would go and strike a round. Any ideas?