the Sphinx was manufactured with a stainless steel frame and an alloy steel (i think it was mixed with zinc or something) slide. it was suppose to be a very accurate handguns with very tight tolernaces. finding one might be a problem and a long wait. the only Sphinxs i have seen lately r the .380 Beretta like semiauto.
i would try for the EAA and have a 'smith that really knows the CZ75/P9/EAA guns down pat. the EAA Witness guns r cheap and upgrading them won't be too painful, and might turn out to be less than a Sphinx to boot!
------------------
Mik
<A HREF="http://"http://marina.fortunecity.com/harbour/347/10mm.html"" TARGET=_blank>my 10mm page</A>