This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to measure gun barrel
Unload the gun.
Open the cylinder and remove any cartridges that are still inside.
Point the gun in a safe direction and cup your left hand around the gun, keeping your fingers clear and away from the muzzle.

Pick from: 1). 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.. 2). 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.. 3). Your right hand should be below the trigger on the gun and to the safety (turn on the " on " switch). Use the gun's handle if you don't have one.. 4). 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..
The answer is:
2).