Athlon Optics , Midas BTR , Magnifier , 5 x 30 , Fully multicoated optics effectively reduces reflected light and increases the transmission of light giving you a Brighter image than Normal single coated lenses Nitrogen purging dramatically reduces the moisture inside the tube and helps maintaining Fogproof and waterproof The aircraft grade aluminum that has exceptional strength and superior mechanical integrity will protect these world class optics no matter what punishment you Throw at it Heat treated one piece chassis gives the scope extra strength. A one piece chassis also is better at keeping moisture out thus keeping your scope fog proof for the life of the product Robust mechanical System with Special designs on both control and erector System that give you the ultimate recoil resistance to withstand 600g recoil for 1000 times