P.B.Dionisio & Co. Lockdown Video #8: Gun Cleaning and Maintenance. Tips from Paulo Paulino. Subscribe to this channel and share with friends you know will find this information useful. Before we begin, it is important to follow the four cardinal rules of safe gun handling: 1. Always treat all firearms as if they were loaded. 2. Never allow the muzzle of any firearm to point at anything you are not willing to destroy. 3. Never put your finger near the trigger until you are ready to fire. 4. Alwa