This safety mechanism is common on most modem lever action shotguns or rifles and is usually activated using a sliding button or bar

The number printed on the outside of the firearm's barrel

The number printed the firearm ammunition

The number printed on the inside of the firearm barrel

The number printed on the butt of the firearm

The safety mechanism is usually activated with a sliding button or bar. The number printed on the outside of the barrel is typically the serial number of the firearm. The number printed on the ammunition is the caliber or gauge of the ammunition. The number printed on the inside of the barrel is typically the chamber length or other important information. The number printed on the butt of the firearm may be a model number or manufacturer information.

What's the answer

I apologize for the confusion. The safety mechanism that is common on most modern lever-action shotguns or rifles and is usually activated using a sliding button or bar is known as a crossbolt safety.

Out of the answer choices which is correct

The correct answer is: The number printed the firearm ammunition.