Which of the following is NOT one of the four firearms safety rules?

The choice indicating that "Assume all guns are unloaded" is not one of the four firearms safety rules is incorrect. In fact, this principle is fundamental to gun safety. It emphasizes the importance of treating every firearm as if it is loaded, fostering a mindset that prioritizes safety and awareness. This rule helps prevent accidental discharges caused by carelessness or complacency.

The other three listed rules are critical components of safe firearm handling as well. "Never let the muzzle cross anything you are not willing to destroy" encourages responsible directional control of the firearm to avoid injuries. "Keep your finger off the trigger until aiming" emphasizes the necessity of not engaging the trigger until ready to shoot, which mitigates the risk of accidental discharge. "Know your target and what's beyond it" underlines the importance of understanding the environmental context before firing, to prevent unintended harm.

Understanding these rules collectively fosters a culture of safety around firearms, which is essential for anyone handling guns.