501-A Lens holder for all irises

23mm lens holder allows a prescription lens to be fitted eye-side of your rearsight
For all other manufacturers irises and our own earlier versions that didn't have the ability to remove the front attachment thread
Mount your prescription lens in the lens holder which may be slid off the rail for easier assembly
Reposition the lens holder on the rail as required and lock it in place
Positioning of the assembly on your rearsight is easily set as the attachment boss has radial adjustment and is simply secured with the allen screw located in the front body