This glitch allows you to shoot without reloading. First, take out a bayonet. Then, go up to an enemy and stab him once. Then, very quickly, stab him again, and, right afterwards, press 1, or another reload button depending on the ammo you want to use. Keep on clicking and pressing the ammo button, really quickly, back up from the enemy while clicking, pressing, clicking, pressing quickly. It will shoot, and not reload. You can then switch to any other gun, and it will do the same thing as long as you make sure you press the button right after you click.