Eugene, on the side, has been working on a single shot 45 gap for me (he had those parts that I bought / traded last year). We talked recently and he said that like Don said above, one working prototype is at Guns & Ammo, while I assume he is finishing the rest.
I have told him that we would make a sticky of his 45 ACP Luger reviews, as he is trying to be very transparent of the 45 Luger and its capabilities. So once he tells me that he has shipped some, I or him will make a thread in the Repairs, Restoration & Refinishing forum.
http://forum.lugerforum.com/forumdisplay.php?f=127
Ed