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