I know a lot of people don't care for the Bushmaster Carbon 15, but my son wanted a AR and his girlfriend bought him one. Well the other day my son came over with his Bushmaster Carbon 15 and he has a problem with it, the problem is he can't pull the bolt back with a loaded mag in it. The same thing with an unloaded PMAG. Now the steel mag works fine as long as its unloaded. Now he can pull the charging handle back and lock the bolt back then insert a full mag in and send the bolt home and shoot with no problem. Can anyone help with this issue.