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 or 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 MI Lifetime Warranty Weight 2.5oz