A Hi-Standard Dura-Matic M-101 .22LR, not because of the gun but the memories associated with the first pistol I ever owned. It was an entry level plinker with a one piece plastic handle that had a nasty habit of fracturing at the recoil lug. (While at college, I traded it for a like-new Ruger MkI target model that the owner had butchered trying to improve the trigger. I installed a Volquatzen trigger group. And, as of yesterday, it's still a good shooter.)