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. We have kept the illuminated Circle Dot reticle of the green or red second focal plane simple, so the field of view is not understood. The bullet drop compensation is calibrated for 55-grain 5.56mm ammunition.

There is no need to worry about waiting for the right mount because the RapidStrike riflescope kit comes with everything you need to reach the range. Included is a cantilever mount to provide the correct cheek pad for the AR-15s, launch lever for quick magnification changes, a honeycomb filter to reduce glare and pop-up, resettable locking turrets that return to zero. The anti-reflective multilayer glass, along with its IP67 waterproof rating, keeps images sharp and clear in broad daylight as well as in low light conditions."