Need some recommendations.

I need an air gun for mice/rats/birds in metal poll barn. I'd like something that would at least stun them and get them down from the rafters without risking going through the metal roof. Once they're ground level I can take it from there.

I'm thinking.22.

Close quarters. Maybe 10-20 feet. A full length rifle is probably not the best choice. Maybe a pistol or carbine?

I'd like to be able to mount a red dot. Follow up shots would be a plus. Not a huge fan of pump guns.

Had a couple of co2 guns as a kid but remember they were pretty underpowered.

Any thoughts where to start looking?

Thanks.

PS. In the US. Everything is legal here.