Which of the following is NOT part of the "4 Rules of Firearm Safety"?

The correct answer highlights that using only brand new ammunition is not one of the fundamental "4 Rules of Firearm Safety." The core principles of firearm safety focus on handling firearms responsibly and ensuring safety while shooting. These rules include keeping your finger off the trigger until you are prepared to fire, treating every firearm as if it is loaded regardless of your own knowledge of its status, and being aware of your target and what lies beyond it to avoid unintended consequences.

The emphasis on these foundational rules is to promote safe handling and awareness, while the stipulation about using brand new ammunition does not address the overall safety practices essential for responsible firearm use. Ammunition quality and sourcing are important considerations but do not fall under the critical safety rules that every shooter should prioritize to prevent accidents and ensure safe shooting practices.