Jack Huntington (JRH) put this one together for me a while back.
I wanted a no lock, square butt Mountain Gun.
It's a 629-1 frame with a titanium cylinder from a Model 357.
It also has the cylinder and barrel from a later model 57 Mountain Gun. Everything but the titanium cylinder has been hard chromed (Mahovsky) to match. Weighs 2lb 8oz with the steel cylinder and 2lb 4oz with the Titanium. Both cylinders have their own ejector rods, so all you have to do to swap em is pull the crane.

Bump with price reduction to $1900.