its a Size 1. fits like a glove. its a little snug around the trigger guard, but it gives good retention. it takes two hands to reholster, but that is to be expected of a holster of that type.
the double gun rig is availible through black hills leather. its called the "face off" rig. you know, like from the movie.....
it seems that is a better option than a double gun shoulder holster. a bit more versatile. but im sure its a literal pain when sitting down.