I could never get comfortable with the horizontal rigs, so I had Jim M. at FIST make one of his model 70 rigs for my 645 years ago. It is a vertical "pull through" design with nothing to unsnap on the draw, you just pull through and begin to rotate and it breaks the snap on the drawstroke...love it. Unexpected benefit was it works with a cocked and locked government model just as well (but the picture is my beloved 645)...