i realize i'm a newbie at it, but for the two holsters i've made so far, i used air soft 'gas blowback' guns for the forms (a baretta 9mm, and a 1911 govt.) both were 1:1 size/replicas. anyway here's a couple places. i have no connection to any of these place, they they came up from a quick google search. i didnt have the real mccoy handy, and didnt really want to get then wet when forming the holsters when i had a substitute handy. anyway take it with a grain of salt, it was just a thought...
eric
evike.com
redwolf
airsoft.com
airgun depot