A combined sight and optic sight mount securable to an upper surface of a firearm comprising: an aperture frame including: a stationary aft aperture frame; and a movable aft aperture sub-frame situated within the stationary aft aperture frame and comprising: opposed vertical sidewalls, a top wall connecting the opposed vertical sidewalls, and a pair of substantially horizontal planar aiming reference members extending inwardly from the vertical sidewalls and defining a gap therebetween.

A combined sight and optic sight mount securable to an upper surface of a firearm comprising: an aperture frame including: a stationary aft aperture frame; and a movable aft aperture sub-frame situated within the stationary aft aperture frame and comprising: opposed vertical sidewalls, a top wall connecting the opposed vertical sidewalls, and a pair of substantially horizontal planar aiming reference members extending inwardly from the vertical sidewalls and defining a gap therebetween.

A combined sight and optic sight mount securable to an upper surface of a firearm comprising: an aperture frame including: a stationary aft aperture frame; and a movable aft aperture sub-frame situated within the stationary aft aperture frame and comprising: opposed vertical sidewalls, a top wall connecting the opposed vertical sidewalls, and a pair of substantially horizontal planar aiming reference members extending inwardly from the vertical sidewalls and defining a gap therebetween.