P.R.O.V.E.
Point the gun somewhere safe. Take all the bullets out. Make sure the gun isn't full. Then check if the inside of the barrel is clear.
"I pointed the gun at the wall and still got shot in the arm.", @GunBro2000
"I took out all the bullets and still got a bullet in my foot.", @GunDude2022
"I checked the bore and still got a bullet in the eye.", @GunNoob420"