Aimsports AR Low Profile front sight is for use with standard height AR15 rear sights. Features ball bearing pivot detent automatically locks into position when raised flipup posilock design to guarantee zero quick detachable with adjustable A2 square post uses standard A2 sight post 0.02 and same plane handguardupper receiver height. 0.65 MOA on 16 rifles and 0.49 MOA on A4 20 rifles.