First day on the forum and I already have a question :?: I Disassembled my MK III for the frist today to clean, I used an online video on how to do this and used another to reassemble http://www.wonderhowto.com/how-to-reass ... ol-258785/ and everything is fine right up until installing the stop pin assembly (2:52) the tip of the pin extends beyond the top of the receiver and I even tapped on it to ensure it is in all the way. My problem comes when I close the latch, something is pulling the pin back out as I try to rotate the latch closed. (3:00) It's making me mad tonight so I'll come back to it tomorrow. Any help is appreciated. Thankyou.