Astra made a small pistol in .22 Short, and the same gun was marketed by Colt under their name. Beretta also made their tip barrel pistol in .22 Short. They are all fairly common and available for a whole lot less than trying to convert a .25 auto. The smallest .22 LR I can think of right now is in the pocket pistol category, the reason being that .22 LR needs quite a bit more slide mass than .22 Short so the gun has to be bigger.
Jim
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