Ok ... I have a friend that has a Saiga 12ga. He stripped it down to clean it and now can't get the bolt back in. I tried and can't get it back in either. I have to be missing something. I've put AK bolts back in without any issues, so I can't figure out with the issue is. Any suggestions?

btw ... he bought a few pro-mag mags, and we were have a few FTFeed with them. Do they usually need broke in or what?