A Message from Shrewd: The Optum Ring System is the backbone of the Optum system and enables quick and easy configuration of the scope. Keep an ORS ready for 3D, field, and indoor with different fiber sizes and colours and swap between them in seconds. Optum Ring System (ORS) for the 29MM, 35MM, AND 40MM Optum Scope This must be used in conjunction with an Optum Scope. The 29MM Optum uses a different size ORS than the 35MM and 40MM Optum. The 35MM and 40MM Optum use the same size use the same size ORS. The Optum Ring System (ORS) makes it possible for shooters to change pin positions, fiber color, or fibre size by swapping between multiple rings in seconds. Includes:-Pin-ORS body-tubing-fiber cover-mounting hardware-green, blue, or orange fiber
