Best way to fix a broken weapon is to throw it away and replace it with a working weapon, and that's what I did. I was checking out Reddit,and apparently you shouldn't load a magazine by dragging it, instead use your hotkeys.

I second that, yes they can definitely clip into walls when the doors are closed, this was also a uncommon issue in .62 @ police stations, as the police station is above ground level.

Known issues (= please DO NOT REPORT these issues on the Feedback Tracker):
setting key binds does not work properly at the moment

Had this happen to me this morning, never seen the Windows 10 BSOD before!

similar problem with my AKM, but i didn't have a full inventory, still can't unload my magazine, so won't be able to defend myself against KOS peeps