Ruger Single Action Convertible in .22 lr / .22 wmrf - with the 6 inch barrel. The gun belonged to a friends older brother, but I managed to monopolize it every time we went varminting, awesome gun for jack rabbit hunting.
But my first serious pistol was a Browning Hi Power 9mm, carried one for several years as a duty sidearm with four backup mags and loved it. I also used a Colt Commander .45 ACP from time to time and loved the hitting power but really preferred the 9mm for carry capacity, since I was often alone in very remote places. I also used a S&W 625 MP stainless in .45 Long Colt for serving warrants or entry duty, nothing like that .45 caliber bore staring down a perp, a gun I'd kill to have another of now, but just can't seem to find anywhere.
Now my primary sidearm is a H&K P30 V3 .40 S&W with a Kahr CW40 as a conceal carry or backup. I also own a Glock 22 .40 S&W for those situations that I don't want to beat up my H&K. And I have a Ruger LCP .380 for the, always got it with me, gun, you forget you even have the darn thing on ya.