Establishes "MarcAnthony's Law;" criminalizes use of defaced or stolen firearm to injure a police officer; enhances penalties for defacing a firearm.

This bill, S 1176 ("MarcAnthony's Law"), creates new criminal offenses for using stolen or defaced firearms to harm police officers. Specifically, it makes using such a firearm to cause *serious bodily injury* a first-degree crime and *bodily injury* a second-degree crime. The law defines "defaced" as altering or removing identification marks (like serial numbers), excluding normal wear and tear. Convictions under this law cannot merge with other charges related to the same incident. It directly affects individuals who commit violent acts against officers with altered or stolen weapons.