The Columbia by Kruger Optical Timberline 3-12x40 Waterproof PHG Riflescope 52203, by Kruger Optical, was designed by U.S. engineers for outstanding performance and reliability. Featuring 1-piece body construction, they're lightweight and built to last. A state-of-the-art optical design delivers a sharp, clear image. Utilizing an advanced 4x erector system, all Columbia by Kruger Optical Timberline scopes are easy to use and boast constant 3.75-inch eye relief. All the optics are fully coated for excellent light transmission. All scopes are water proof and filled with dry nitrogen for reliable, fog-free performance in the most punishing conditions. Resettable, accurate ¼-minute windage and elevation clicks allow for precise sighting. The power selector rings on these riflescopes are rubber-coated for easy adjustments, even while wearing gloves. Quick release protective scope covers are included. The Red Dot sight offers multiple reticles and an advanced electronic illumination system. Sleek, lightweight scope mounting systems are also available.