Yes in the city limits it is illegal to shoot off fire arms, doesn't stop some people though. There are some fire arms that can be legally shot off. Years ago I had a problem with squirrels in my attic (what an opening) Had to have a new roof put on, but first had to get rid of the squirrels. Problem is once they have made a home in your house they keep coming back. I couldn't put out bait because I didn't want to kill the nice squirrels...just needed to evict the renters :-) So I threw our largest cat up the attic opening....then ran outside to sit under their exit hole. Once there I used a CO2 pellet pistol to pick them off. I must have been a pretty scary sight. Running in and out of my front door, sneaking around the side of the house holding that gun...because the little old lady behind me called the police :-) The
officer and I had a good laugh about it and he even hauled off the evidence of my crime.