These sights are removable with push Button QD Flip-Up Style High precision targeting system Spring-loaded sights deploy at the push of a button to provide instant backup sighting. Quick Deploy System locks securely and requires a firm， positive press of the button to deploy or retract the sight， so it wont accidentally activate when bumped. Mounts to all picatinny rails. Dual aperture on the rear sight with sight adjustments for sighting. Front sight adjusts up and down for sighting.Front and Rear Folding HK Style Battle Sight. Easy to install for low - light shooting! You won't find a more durable， reliable sight for your money! This easy-to-install rear sight is a tough-as-nails， stripped-down version for no-nonsense shooting under pressure. No levers or springs to fumble with so deployment in the heat of battle won't give you trouble. Simply press the release button to fold down into locked position. Features rugged aircraft aluminum and stainless steel construction for long-lasting field use. Dead-center shot: Has zero-canting attachment system for use on all military and aftermarket receivers; Each click is 1/2 M.O.A; No tools required for adjustment; State Color. Pick yours up now! . Features: - most accurate Front sight for 5.56/.223 - Faster target acquisition with Aperture - Increases accuracy to 550m- Quick install， easy adjust - 0.460" profile when folded- Protected adjustment wheel - Dual same plane aperture .50 MOA per click - Aircraft aluminum 6061 & stainless steelNote: Sight is designed to work on same plane rail systems only. Will not work with a railed gas block that is higher or lower than the receiver