Includes: Flip Up Front and Rear Sight Materials: Polymer Weight: 4 oz Color: Black Compatibility: Picatinny and Weaver-style Rails Warranty: Lifetime Guarantee Spring action, Posi-Lock design guarantees zero every time. Receiver height front sight features a complete A2 square post assembly. Easy precision adjustments for windage and elevation. Made from durable, lightweight black polymer This set of Flip Up polymer sights is the perfect option for shooters who need a back up that won't interfere with their primary optic. These practical Flip Up Sights provide all the accuracy of fixed iron sights, but conveniently fold away when not in use. When folded down, you get an unobstructed view through your optic and with one simple push they spring into action. Instant back up iron sights (BUIS). The receiver-height front sight features a classic A2 square post that easily adjusts for elevation. The rear sight easily adjusts for windage with a knob, providing audible and tactile clicks for precise adjustments. Made from a tough, lightweight polymer, these fold away sights are built to withstand rough conditions and mount easily to the top of a picatinny rail using a simple hexagonal screwdriver. All Monstrum firearm accessory products come with a lifetime guarantee.