There are professional ratting teams. Shockingly, most have wait list for openings. They are used by exterminators. Commonly for high rat population areas like dumpsters at the mall or by groceries. Done at night, off business hours.

They use some very expensive pcp air rifles with very expensive scopes (often ir or thermal).

They are very picky about who they let on. Don't want a stray .22 pellet going through someone's house window or body.