The ATN Aries MK 350 is the most compact 1st Gen. Weapon Sight on the market. Measuring only 9 inches long and weighing 3 lbs. the ATN Aries MK 350 is one of the most rugged yet compact scopes made. The accuracy on the ATN Aries MK 350 is unparalleled thanks to our "Red on Green" reticle system. Windage and elevation adjustments are an amazing 1/8 inch at 100 yards. Combine this accuracy with other features such as a super fast Front Lens System for optimal brightness, easy push button operation, reticle brightness adjustment, our detachable most powerful in the industry 450mw Infrared Illuminator and you have one of the best 1st Gen. scopes made. If you are looking for a small, lightweight inexpensive Night Vision Weapon Sight then the ATN Aries MK 350 is the scope for you. The ATN Aries MK 350 Weapon Scope easily mounts onto any U.S. standard 7/8" weaver or Picatinny rail.