Ledsniper&reg; New Design Smart Flip up Front and Rear Tactical Polymer Sight Set Quick Detachable Front Sight with Adjustable A2 Square Post Assembly to Fit All Picatinny/Weaver Style Rails Equipped with Locking Retention Allen Wrench and Clever and Robust Flip-up Posi-lock Design to Guarantee Zero in the Most Extreme Combat Condition Precision Elevation Adjustments to Enhance Shooting Accuracy  Profile Designed for Installation on Gas Block  Integral Picatinny Mounting Deck to Fit All Flat Tops Dual Aiming Apertures for All Shooting Requirements Clever and Robust Flip-up Posi-lock Design to Guarantee Zero in the Most Extreme Combat Conditions