Actually, a 3" M36 SB is what I've got. Amazing what that extra inch does for accuracy. Regarding holsters, there seems to be an agreement between all holster makers to never, ever, make one for a 3" M36.

So I'm getting by with a Bianchi thumb snap Black Widow. 1" protrudes from the bottom and in order to not snag the front sight during a draw cycle I'v had to modify my draw to a more straight up movement. At least it's a holster.