Like armor, when you put a gun near someone, it immediately attaches to their body like armor would, and whatever arm is not facing the gun, (So if the left hand had the gun but the right hand doesn't) if it is a rifle or a tow handed gun, the other arm should go around the body and go in the right position.
0rava, I have just one little problem with this game, whenever I try to put on some tactical armor on a ragdoll, it will go crazy, slide over, then rip it's torso apart. 0rava, please find a way to fix this bug, I will highly appreciate it.