A Daisy BB gun, lol. If your goal is to take out rodents like that, I'd suggest a break-barrel pellet air rifle that's got some oomph behind it.
Shortly after we bought our house I got a $100 break-barrel .22 Hatsan because I was seeing rats coming out of the old coop after dark and using the...
Similarly I have moles and gophers and field mice/rats that will use their tunnels - so in my secure coop/run I excavated about 4-6” below grade and put down HC on the ground, then put the dirt back + ~8” of wood chips over that.
Was a lot of work but almost 2yrs later there’s no evidence of...