45 deg angled front and rear sight for use with standard AR-15. Locks positively in the up position. Features: 45-degree off set mounts to standard Mil-Spec 1913 Picatinny rails Ball bearing pivot detent Automatically locks into position when raised to the shooting position Flip-up standard A2 style front post Flip-up A2 style dual aperture rear peep sight 0.49 MOA on A4 type rifles 0.65 MOA/M4 carbine