What a kick in the old memory bank! I hadn't thought of that .22 Luger for years, though I now recall the article. Those "concept" guns get made or maybe mocked up, written up in some gunzine, and disappear. The idea of a bottleneck high power small bore pistol round is not a bad one (anyone thinking Five seveN here?) but using a dead end and finicky platform like the Luger would, IMHO, be pointless.