Unlimited revolver ammunition
Get a second object and select it. Intentionally waste all your ammunition with the revolver, then save your game. Make sure your second object is still highlighted. Load your game and you will see that you have 0 ammo. Shoot once and a bullet will appear, and the second object should still be highlighted. After a message you will have unlimited ammunition while the second object is highlighted. Note: This will not work with any other gun.