ok so i have an AR 10 rifle that on a empty mag works fine. as soon as i take the mag out of the rifle and attempt to lock back the bolt with the bolt catch button it will not work. i can feel and see the bolt catch just barely touch the bolt face but will not grab it to keep it locked back. i tried switching a spring and buffer from one of my AR 15 rifles to this rifle just to verify it was the right spring and im thinking it is because when i put the 15 spring it it wouldn't even let me pull the charging handle back far enough to get the bolt face past the catch with the original spring it does so i don't think that is the issue. any suggestions on what might be causing this?