US Patent 7634866 Gun site having removable adjustable modules

A gun sight including a lens through which a target may be viewed and a light source for directing a point of light toward the lens, the point of light being reflected by the lens toward the viewer. The location of the reflected point of light with respect to the viewer along both windage and elevation axis is adjustable, and elevation and windage modules for permitting the adjustments are removable from the remainder of the gun sight without disturbing the adjusted and windage elevation settings.