US Patent 9163902 Sight module

A sight module includes a mounting base for detachably mounting on a firearm, a sight unit including a sight housing upwardly extended from the mounting base, a reflex sight including a light unit supported by the sight housing for generating a sight reticle, and a foldable lens movably coupled at the sight housing and being actuated to move between a first position and a second position. In the first position, the foldable lens is folded at the sight housing. In the second position, the foldable lens is moved to outwardly extend from the sight housing, such that the sight reticle generated by the reflex sight is projected on the foldable lens in the second position.