After several years of looking for a holster for my 617 and 686 both with 6? barrels and red dot sights I finally decided to go cheap and start cutting on one. I chose a leather holster from TonyU Leathergood for only $32.39 shipped from Esty. The holster is a little rough but made of heavy leather and put together reasonably well, even has a leather patch sewn over the back of the snap to keep it from rubbing the trigger guard. I cut out a slot for the sight, sanded all the rough edges, and burnished them a little. After a few years of being drug through the woods squirrel hunting and the brier patches chasing rabbits it won?t look much worse than an expensive holster would.
http://www.handgunhunt.com/photopost/showphoto.php?photo=10501&limit=recent
http://www.handgunhunt.com/photopost/showphoto.php?photo=10502&limit=recent

I believe that will get the job done.

Bob R

That's exactly what I did with both my chest rigs.