Flip-up Firearm Rear Sight

FIG. 1 is a Perspective view of a flip-up firearm rear sight showing my new design;

FIG. 2 is a Front view thereof;

FIG. 3 is a Right-side view thereof;

FIG. 4 is a Left-side view thereof;

FIG. 5 is a Top view thereof; and,

FIG. 6 is another Perspective view of the flip-up firearm rear sight in FIG. 1 shown in a stowed configuration.

The broken lines depict portions of the flip-up firearm rear sight that form no part of the claimed design.