I say "possible" since I'm not sure if it's intentional or not:
To sum up what I was talking about in the video:
The MP5s and G3A3 should have another reload stage right when you lock the bolt IMO. It doesn't make sense that it's not saved without taking the magazine out.
When the mag is taken out of the MP5s or G3A3 with a shot still loaded in the gun, firing the last shot in the chamber locks the bolt back. I'm not sure if this actually makes sense or not (hence why this isn't in the Technical section) but I don't think that's correct.
In the Firing Range, if you're standing next to the supply cache and you change your loadout, your weapon bugs out and is fixed by switching weapons (Happens at 2:05 in the video).