Rear sight Irises Gehmann are extremely robust and compact construction, made with top quality mechanical precision components, turned or milled from the best possible materials.The distance between the shooter’s eye and iris can be regulated individually.A threaded steel ring provides better protection against the tension on the glass panel while adjusting the position of the iris. It now features The tunnels full-length fine thread that allows the eyeshield and environment filter to be attachedA thread on the front side of the rear sight iris enables the attachment of central filters and further additional accessories such as color and polarization filters as well as anti-glare tubes.Bullet shift: 1.0mm per click at 50mContact us at 70822-33324, if the product is in pre-order status