US Patent 10139197 Firearm sight with retractable sunshade

A firearm sight comprises a sight body including a clamp at its lower extent for removably securing the sight to a portion of a firearm. An upwardly facing surface is disposed on the sight body above the clamp and a housing projects above the upwardly facing portion, the housing containing a lens assembly. A shade is carried by the sight body, the shade movable along the sight body from a retracted position in which the shell is at least partially contained by the housing, and an extended position in which the shell extends over the upwardly facing surface.