The Emergency Rear Sight (ERS) is a folding, A2-style, dual aperture rear sight that mounts to any flattop AR-15 upper or M1913/Picatinny-style rail. It locks firmly in the up or down position via a detent button, ensuring positive activation. Windage knob is identical to that used on the M16 A2 rear sight. Constructed of hard anodized 6061 aluminum.
A2 style dual apeture
Standard M16 style windage knob
.65 moa on M-4, .49 moa on A-4
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