The NXS 3.5-15x50 F1 was created by Nightforce Optics Inc. at the request of U.S. military and other professional sharpshooters for a scope that is fast, applicable to a wide range of targets at various distances, and offering a choice of elevation/windage click values, reticles and ballistic turrets with Nightforce ZeroStop technology. The Nightforce F1 is offered with a choice of three different windage/elevation adjustments: .250 MOA, .1 Mil Radian, or 1.0 MOA elevation/.5 MOA windage. There are two optional engraved ballistic turret caps offered (available separately); one for the 1.0/.5 MOA version specifically marked for the A-191 (.300 Win. Mag./190 gr. Sierra Match King), or for the M118LR (.308/175 gr. Sierra Match King), marked in meters. The standard cap comes with an MOA scale, which the user can have custom engraved to match virtually any caliber once that caliber’s ballistics are established.