S&W model 61 Escort:
in my opinion, the Beretta model 70s, or the model 71 Jaguar is the very best .22 rimfire pistol in the "small" category. very accurate, extremely reliable, holding 8+1 in a small package.
they are not really a pocket rig though. essentially, most everyone that tries one of these rigs, ends up trying to find one. i first used one in 1971, and was instantly hooked...