Aimsports ar-15/m4 flip up rear sight feature dual aperture for long and short range, ball bearing pivot detent, automatically locks into position when raised, flip-up posi-lock design to guarantee zero and a2 style dual aperture, small aperture: 0.070", large aperture: 0.200".0.65 moa on m-4 type rifles and 0.49 moa on a-4 type rifles.Rear Color: Black AnodizedType: Flip Up Front/RearFrame Material: AluminumFrame Color: Black AnodizedFirearm Fit: AR-15Style: Low Profile Flip UpFront Material: AluminumRear Material: AluminumFront Color: BlackWindage Adjustment: 0.49 MOA A4 Rifle/0.65 MOA M4 CarbineFirearm Type: Aircraft Grade Aluminum