I picked up a sporterized 1916 SMLE a week ago and I'm in the process of cleaning it up. An issue I'm having is that the magazine won't seat properly in the receiver, like it's not hitting the catch or something? I can see a gap of about 3/16" between the bottom of the bolt and the top of the magazine. I've cleaned a bunch of gunk out from the magwell and I still cannot get it to seat all the way. I was also wondering if anyone had experience in adjusting the feed lips of these magazines? Thanks.