BARSKA 10-40X50 AO Varmint Target Dot Riflescope Long-distance riflescope with 10-40x magnification and 50mm objective lens Adjustable objective for parallax correction and unsurpassed distance accuracy Multicoated and fully multicoated optics increase light transmission for improved clarity Waterproof, shockproof, and fogproof housing; quick-access magnification room ring Target dot reticle; measures 15.5 inches long and weighs 20.53 ounces; limited lifetime warranty Please be advised, this scope is rated for .223 / 5.56 caliber ammo, other higher caliber guns will cause damage to the internals of the scope causing it to be unable to hold zero