Features two, flip-style apertures for close engagement and precision, distance shooting. Large, ghost-ring for close ranges has .230" I.D. opening; precision, long distance aperture with .100" I.D. opening. Elevation does not change when switching apertures. Direct replacement for factory rear sight, no modifications to the rifle are required.
Make: AR-15/M4, M16
AR-15 Rear Aperture
Black Matte Finish
.230 (5.8mm) I.D. Large Aperture
100 (2.5mm) I.D. Small Aperture
Made in the USA