Please choose the correct ending to complete the given sentence: Sports and Fitness: [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.

Ending1: If you're using a utility knife, don't push the knife out as it will damage the cartridge. Slide the knife out so that there is little space between your fingers and the cylinder. Ending2: 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. Ending3: Your right hand should be below the trigger on the gun and to the safety (turn on the " on " switch). [title] Use the gun's handle if you don't have one. Ending4: The gun should have a rounded collection of " tick points " on it that will indicate where the cylinder and chamber will be placed once the bond is found in the gun. It does not have to be a conclusive location, but it should be near enough to your body so that you can determine where you will be placing the gun.

Answer format: ending1/ending2/ending3/ending4