For pure "plinking," I've settled on this Colt Mod. Gold Cup CO[size=10]2[/size] Air Pistol, Cal. .177 (4.5 mm). With it, I can sit in a rocking chair on the elevated front porch of the cabin at Critter Creek, plinking away at a cork floating in the pond below while waiting for the occasional slow-witted field mouse to show himself beneath the bird feeder. My beloved little wife, with only a hint of condescension, tells me that on such occasions I am "getting in touch with my inner child." :D
(http://i2.photobucket.com/albums/y30/RichardS/coltmod.jpg)