A number of years ago, I carried an S&W model 669 in a shoulder holster. It was basically leather at the back of the slide with what I would call "rubber bands" which went around the front of the trigger guard. I carried it for about a year and sold the gun with the holster. I never had any issues with this setup. I was wondering if anyone knows the name of the company and if they are still in business.
I know this is a "shot in the dark".