TacFire Low Profile Polymer Flip-Up Front & Rear Sights With Dual Aperture,Black TacFire official product, low profile Polymer flip-up front & rear sights Picatinny/Weaver with dual Aperture/black Spring loaded with flip-up Posi-lock design to guarantee zero Front sight A2 post with elevation adjustment Rear sight with dual Aperture with windage adjustment designed for close QUARTER Battle