Empty lens housing for the Optum scope. This housing fits any lens that is 1.75" in diameter and at least .08" thick. Made from aluminum and anodized for durability. Once a lens is installed the two parts should be locked together using a thread locker. Allows installation of a sunshade on the target side of the lens. Fits both 40mm and 35mm Optum scopes.

Features:Fits any lens 1.75" in diameter;Aluminum construction;Anodized