If there is such a thing as a "professional" riflescope, it is an ATACR(TM). They are designed for military, law enforcement, and other tactical professionalsa |and for those who simply want to shoot like a professional. An ATACR(TM) riflescope is the combination of the finest materials, engineering expertise, mechanical reliability and optical performance available today. Simply put, there is no expense spared, no detail overlooked in building a Nightforce ATACR(TM). The 4-20A-50 F1 fills an important magnification range in the ATACR line. Equally at home atop a bolt action or a semi-automatic rifle, the 4-20A-50 F1 is smaller and lighter than the 5-25A-56 F1 while offering a 25% improvement in magnification over the 4-16A-42 F1. With Digillum, a ZeroStop turret, power throw lever, ED lenses, and 20x max magnification, the ATACR 4-20A-50 F1 is their apex mid-power scope. The Horus Tremor3 Illuminated Reticle: The Accuracy 1st - Speed Shooting Formula is built right into the elevation hold of the reticle making even faster shooting possible. It's field-proven to make wind calls easier. The reticle also allows one to accurately mil targets very quickly. Illuminated version. Includes : Tenebraex Flip Up Covers Cleaning Fob/ Cleaning Cloth Multi-Tool Power Throw Lever Stickers Owners Manual Windage Beauty Ring Sunshade