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 push button operation, reticle brightness adjustment and our detachable, most powerful in the industry 450 mW Infrared Illuminator with dedicated windage and elevation adjustments. Our ATN Aries MK 410 is the best 1st Generation Scope on the market. The controls are ergonomically designed and can be used with ease in total darkness. The Scope easily mounts onto any U.S. standard 7/8" weaver or Picatinny rail. The ATN Aries MK 410 is an excellent tool for varmint hunters against rodents that cause farmers problems. Please check your local game and fish regulations for legality of use.