This AR-15/M4 flip up rear sight with locking feature has dual aperture for long and short range targets. This Low profile flip up rear sight is made from black hard anodized aircraft grade aluminum with steel ball bearing pivot detent and hardware to automatically locks into position when raised. The Flip-up posi-lock design to guarantee zero evrey time through the A2 dual aperture. 0.65 MOA on M-4 type rifles 0.49 MOA on A-4 type rifles. Limited lifetime warranty.
We suggest you get Item # MT200 AR15 Front Flip Up Sight Designed To Work With This One.