Promag M16/Ar15 Flip-Up Sng Sgt

Attaches to flat top A3 upper receivers. Use as back-up rear or lightweight rear sight along w/red dot or holographic sight. Locks in upright position (spring-loaded release must be depressed to place sight in down position). Has 0.199" & 0.73" apertures on same sighting plane allowing both apertures to be sighted to same point of impact. 4 apertures - rotating dial in either direction brings next size aperture to view. Windage adjustable w/standard A2 windage adjustment drum. 1 click for 0.50 MOA rifles / 0.65 MOA on carbines. Black oxide carbon steel & black anodized aircraft-grade aluminum.