Kimber did the conversions in the mid to late 1990's. I recall seeing them advertised in the back of the annual gun publications then. Other companies also did/sold Swedish Mauser sporterizations as well including Samco (positive) and Century (pretty sure on the latter). In a '97 issue of Gunlist, there was even an ad for a Youth sized package (rifle,plastic hard case, etc...) Swedish Mauser sporter from Samco.