Shrewd Optum Ring System - OD Green OD Green 40mm/35mm .010 Pin
Shrewd Optum Ring System - OD Green OD Green 40mm/35mm .010 Pin, The Optum Ring System (O.R.S.) makes it possible for shooters to change pin positions, fiber color, or fiber size by swapping between multiple rings in seconds. This must be used in conjunction with an optum scope.