At first I couldnt shoot guns at all, trigger seemed to do nothing but i could reload with grip button. Exited game and next round when I pressed the trigger, the firing was slightly delayed but I could now shoot zombies. However, the guns would continue to fire on their own. I would just aim at the zombies and the guns were auto spraying. Again, grip buton reload there was no issue. Tried reducing specs to minimum, didn't help. Graphics and playwise my rig had no difficulty running on highest setti...