Aim Sports Low-Profile Rear Flip-Up Sight for AR-15/M-4 Rifle - MT201

AR-15/M4 flip up rear sight with locking feature. Dual aperture for long and short range.Features:Ball bearing pivot detentAutomatically locks into position when raisedFlip-up posi-lock design to guarantee zeroA2 style dual aperture0.65 MOA on M4 type rifles0.49 MOA on A4 type rifles