22QBAirsoft shows the Firefrield Rapid Strike 1-6x24 optic that they have available at their online store... "Your do-it-yourself shotgun needs a do-it-yourself optics. With the RapidStrike 1-6x24mm AR-15 riflescope kit, you get speed, accuracy and distance. 1-6x magnification provides fast and accurate shooting and shooting capabilities with no target or reticle distortion, 2-6x is the perfect magnification for medium distances.