A repro "1913 Artillery Stock/Holster" just sold for $900 on eBay. As far as I know, BATF has not exempted this stock for use on an Artillery Luger. The only Arty that could be considered legal for this stock would be the prototype 1913 Artillery, of which there may be one or two in existence. Someone just dropped a bundle on something that is not even legal to own if you have any Luger of any description with a stock lug. Please correct me if I am wrong.
http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA:IT&ih=018