Ruger, A little bit of history on pocket pistols, the current favorites like your P938 are derived from the Star Model D (few imported to US) and the more familiar Model DK which incorporated an aluminum frame. The DK made it's way to the US in the early fifties in fairly large numbers, the 68 gun control fiasco stopped importation so FI (the importer of all Star pistols at that time) made a steel frame in the US and imported kits of parts to build pistols. The first of these pistols were provided to Colt with Colt Pony markings and S/N prefix CPA, after evaluating approximately 100 pistols Colt (in all their corporate wisdom) rejected the program and most pistols were returned to FI, scrubbed of Colt markings and remarked FI (I have a "scrubbed"pistol) then released as the FI model D. The CPA prefix was continued throughout FI production. Later the Mustang appeared which is a slightly more modern Model D, again with the new popularity of the micro 380 style of pistol Sig released the 238 and Kimber the Micro....all of these pistols are simply a modern version of the ole' Star DK. I have all of the pistols mentioned (oh forgot the IJ Pony...same pistol as Mod D) and find it interesting that mags for the Sig, Colt and Kimber Micro all interchange and would also fit the DK and FI if not for differences in the bottom of the frame. My Sig's, Colt and Micro all run flawlessly and always have and I find it interesting that one poster had Micro difficulties, rather than storing in the safe I would return it to Kimber and have it made right, they are really fun shooting little pistols.