When playing a local Forge match on any level, lower your weapon in Monitor mode and turn back to human. Your weapon will now be invisible. Get on a turret or vehicle and get off. Your gun will be glitched. If you dual wield, only one gun will be visible.
In a Forge match while holding anSMG, if you melee then hold , you will hear the gun shoot but you will not be shooting. Also, if you shoot with it while holding R, go into Monitor mode to hear your SMG still firing even though you are not.