[JoeProBono]

CO2! Yeah, that's the ticket. Got me this nitro-piston and it's great except for the upper body strength needed to load:)

Benjamin Trail NP®, Synthetic, .22 cal | Gas piston Air Rifle

[Texas Fossil]

Squirrel gun? Also great for rats and snakes.

I killed 3 large rattlers in our implement shed last year with a 177 caliber pump up Daisy air rifle (used BBs). (did not damage the building, by choosing the shot.)