Push or pull the cylinder release latch on the left side of the gun with your right thumb. Swing the cylinder out to the side of the gun.
[header] How to measure gun barrel [title] Unload the gun. [step] Open the cylinder and remove any cartridges that are still inside. [substeps] Point the gun in a safe direction and cup your left hand around the gun, keeping your fingers clear and away from the muzzle.