Midwest Industries ERS Flip Up Rear Sight - Black

• A2 style dual aperture, fully protected from accidental damage • Thick rugged pivot ears, twice as thick as the competition • Made from 6061 aluminum, mil-spec hard coat anodized to stand up to the most extreme conditions • Locking detent with double the locking surface, for maximum strength • Lock detent button with stepped down turns, to provide a surface you can grab onto if your hands are muddy of wet • Same style windage knob as on the standard M-16: .65 MOA on M-4 type rifles / .49 MOA on A-4 type rifles • Made in U.S.A. with Lifetime Warranty