Nightforce ATACR 4-20x50mm FFP Mil-C Illum. ret. C643

ships from our shop in 3 to 5 days (+/-) First time buyers subject to ITAR screening

Nightforce ATACR 4-20x50 F1 Illuminated Mil-C reticle

King of the mid-magnification, the ATACR shines


4-20, 4-20x, ATACR 4-20, Nightforce, Nightforce ATACR, Nightforce 4-20, Mil-XT

The Nightforce ATACR 4-16x was a great seller in the mid-magnification range, and like always, customers wanted more.  So, in 2021, Nightforce introduced the 4-20x, with just a modest increase in size and weight, with all the greatness of a scope for the 300 to 800 yard range, and now a little more umph to get you a little further, or a little crisper image at the same distance.  ATACR is built bomb-proof, so the ATACR 4-20x with 5x magnification is a great all around tactical and target scope.

With a mid-magnification range scope, the ATACR is a multi-purpose scope.  Built for the battlefield, but just as comfortable at the range or at a PRS match.  This precision optical instrument has applications in the hunting, competition, and tactical fields, and is equally at home atop both bolt-action and semi-automatic rifles. Its highly flexible magnification range enables it to be used on setups intended for both mid and long range, and its power throw lever allows the user to rapidly switch between the two. As with all ATACR riflescopes, the 4-20x50F1 comes standard with the ZeroStop elevation turret. This function allows the shooter to instantly return to their scope’s original zeroing after making on-the-spot elevation adjustments.   

The ATACR family of riflescopes defines Rugged, Reliable, and Repeatable. ATACR scopes are built with only the best materials available to deliver benchrest precision even under the harshest conditions.

The ATACR 4-20x scopes come equipped with multi-coated ED glass that results in superb light transmission, brilliant images, and exceptional color contrast. With the varying magnification ranges, the ATACR line of scopes can cover almost any situation a shooter may have. Featuring sophisticated reticles, these scopes leave nothing to chance. The ATACR from Nightforce redefines the "long" in long range, leaving the possibilities endless. Nightforce is already known for ruggedness and reliability in their riflescope lines, and the ATACR is no exception; building from his foundation, the scope has many features, including:

  • Integrated Throw Lever
  • Xtreme Speed Thread
  • Hi-Speed ZeroStop
  • DigIllum reticle illumination

This ATACR scope comes with the Mil-C reticle.

The Mil-C reticle is a classic milRAD clean and lean reticle, with the added benefit of some range-finding properties.  The Mil-C and its brother, the Mil-R have been extremely popular reticles, and customers keep returning who enjoy the uncluttered refinement and First Focal Plane excellence.

Designed to meet the needs of today’s Precision Rifle Series competitor, the MIL-C™ reticle allows for fast and accurate shots on target. The MIL-C™ has a simple center dot for a fine aiming point, while the main lines feature .2 Mil-Radian holds. Each whole Mil-Radian is numbered for fast reference under even stressful conditions. 

Range estimation

The Nightforce MIL-C™ reticle can provide you with an accurate distance to your target, when the size of the target is known, by utilizing one of the following Mil relation formulas:

  • (Target Size in Inches ÷ Image Size Measured in Mils in Reticle) x 27.77 = Distance in Yards
  • (Target Size in Inches ÷ Image Size Measured in Mils in Reticle) x 25.4 = Distance in Meters
  • (Target Size in Centimeters ÷ Image Size Measured in Mils in Reticle) x 10.93 = Distance in Yards
  • (Target Size in Centimeters ÷ Image Size Measured in Mils in Reticle) x 10 = Distance in Meters

For example, a standard stop sign measures 30” tall x 30” wide. Knowing the size of the target, in this case, a stop sign, and applying the correct formula above, you will be able to accurately calculate the distance to your target.

  1. Known target size = 30”
  2. Image size = 2.5 Mils. To measure image size of target in Mils, refer to the reticle diagram above.
  3. Divide target size (30”) by image size in reticle (2.5) = 12
  4. For distance in yards, multiply 12 x 27.77 (constant) = 333.24 yards to target.
  5. For distance in meters, multiply 12 x 25.4 (constant) = 304.8 meters to target.

Your ability to accurately measure your target in your reticle does take some practice to become proficient.


Scope Weight: 35 oz
Mounting Length: 5.9"
Scope Length: 13.9"
Magnification Range: 4-20x
Scope Objective Diameter:        50mm
Scope Tube Size / Mount: 34mm
Scope Turret Adjustment: .1 MilRadian; 12 Mils per revolution
26 mils elevation and 18 mils windage
Reticle Position: First Focal Plane
Field of View: 4x: 23.6 ft @ 100 yards
16x: 6.1 ft @ 100 yards
Eye Relief: 3.5"
Elevation Features: ZeroStop
Illuminated Reticle: DigIllum
Scope Finish: Black
MPN C643