The ATN manufactures the largest line of Night Vision Weapon Sights. We set out to design the best 1st Gen. Scope on the market and we succeeded. We started by improving the optical configurations which lowered the F-stop factor and increased optical resolution. By doing this more light travels through the lens to the tube. More light and better resolution simply means brighter and sharper image. Then we added our precision "red on green" aiming system, easy button operation, reticle brightness adjustment and our detachable, most powerful in the industry 450mw Infrared Illuminator with dedicated windage and elevation adjustments. Our ATN Aries MK 390 is the best 1st Generation Scope on the market. The controls are ergonomically designed and can be used with ease even in the total darkness. The Scope easily mounts onto any US standard 7/8" weaver rail. The ATN Aries MK 390 is an excellent tool against rodents that cause farmers problems. Please, check your local game and fish regulations for legality of use.