I put one on mine years ago, I got it from Dixie Gun Works. Mine is a single stage(must be set to cock)which is OK for target work.
T.O.W. has some on their web sight. They have both single and double stage.
The one I installed required only a little inletting and had room to alter the steel trigger plate some. The original trigger guard worked fine. Had to drill & Tap for the tang screw.
My lock already had a fly in the tumbler, so nothing needed there.
Jon
