Final answer:
Among the options given, 'Using the muzzle of the gun as a pointer' is not a firearm safety skill.
Step-by-step explanation:
The option in the list that is not a safety skill for using a firearm is 'Using the muzzle of the gun as a pointer'. It is important to always use firearms responsibly and part of that responsibility includes treating all guns as if they are loaded, keeping your finger off the trigger until you are ready to shoot, and securely storing firearms when not in use. Pointing a firearm at anything other than a target you intend to shoot is unsafe and violates basic gun safety rules. The other options listed: treating all guns as if they are loaded, keeping your finger off the trigger, and storing guns securely are all recommended safety practices. Police departments may require that firearms be kept unloaded and secured with a trigger lock unless being used for legal activities.