The Erma RX-22 and PX-22 were assembled in the USA from parts purchased and imported from Erma and stamped with the tradename of the retailer. Erma is a German firearms maker who were under control of the Nazi's during WWII and made the .22 rimfire conversion for the Luger. When the war ended, Erma, along with other German firearms makers were prohibited from the manufacture of fires. In 1964, Erma again returned to the field of "Sporting" type firearms. Primary importers and assemblers in the USA were Excam of Hialeah, FL,Beeman of Santa Rosa, CA and Mandell Shooting Supplies of Scottsdale AZ. Both Excam and Mandell's have gone out of buisness and there have been rumors about Beeman's particularily in regard to powder guns. In turn, Excam was in the buisness of suppling "hardware" guns to the trade and may have been the actual supplier to Madison....who..btw does not appear in either the Standard Catalog of Firearms or in the Gun Digest Book of Modern Gun Values or does it appear in The NRA Firearms Sourcebook. You may find something on the NICS list(www.atf.gov) or at www.bluebookinc.com..and..if it is not found in any of these publications..chances are it will be difficult to find parts for. You could also peruse the listings of companies like www.gun-parts.com....www.hoosiergunworks.com and aftermarket magazine maker Krasne's at www.triplek.com..truthfully, if Triple K isn't making magazines for it...I'd stay away from it!