Perfect AR15 Rifle Scope – Nightforce ATACR 4-16×42

NIGHTFORCE ATACR 4-16x42mm AR15 Scope

AR15 first-round hits out to 860 meters with a 4-16x42mm scope!



  • OBJECTIVE: 42mm



  • OA LENGTH: 12.6 inches

  • WEIGHT: 30 ounces

  • EYE RELIEF: 3.35-3.54 inches

  • EXIT PUPIL: 10.3mm at 4X; 2.7mm at 16X

  • FIELD OF VIEW: 26.9 feet at 4X; 6.9 feet at 16X

  • ADJUSTMENTS: 0.10 mils per click


  • MSRP: N/A

Read why the NIGHTFORCE ATACR 4-16×42 scope is the best choice for your AR15 rifle. The NIGHTFORCE ATACR 4-16×42 scope with TReMoR3 reticle is the perfect match for all occasions.

The Best AR15 Tactical Rifle Scopes

Purpose-built for combat: The NIGHTFORCE ATACR 4-16×42 is purpose built AR15 rifle scope. For hunting or combat the scope is rugged, accurate and dependable.

NIGHTFORCE ATACR 4-16×42 SCOPE: Visually diverse, mission adaptive

No matter which reticle you use, the 4-16x42mm ATACR is an excellent scope. In fact, it’s the best Nightforce scope I have ever used. This is a high-quality optic, and its design is incredibly useful, especially in this power range. I will definitely be using this scope more often, on many different platforms, to great effect and with considerable enjoyment!.


NIGHTFORCE ATACR 4-16×42 SCOPE: You can count on your scope – for life!

Light gathering properties allow for an adequately bright view. Precision built components bring together consistently crisp optics with unparalleled accuracy – the best AR15 rifle scope on the market.

NIGHTFORCE ATACR 4-16×42 – AR15 Sniper rifle scopes – Counter sniper, terrorist, hostage! A truely all-in-one AR15 rifle scope that allows you to engage the enemy in any given situation. Perfect for hunting at any range including low-light situations.


Years of history – A High Quality Battle Ready Scope

Best AR15 Riflescope Sale :: NIGHTFORCE

NIGHTFORCE has been making rifle scopes for the public, private industries, and the military M16 rifles for many years now. Their products must pass military standards to qualify for in-field use.

Designed for the Modern AR15 Carbine

Colt manufactured their first 300 AR-15s in December 1959. Since then, the AR15 has evolved – so NIGHTFORCE set out to design the perfect match for tactical rifle scope to AR15 rifle.

The Best AR15 Rifle Scope – NIGHTFORCE ATACR 4-16×42 – Battle proven in war

AR15 optics have been many and plentiful – but many were designed to be used on different calibers. The NIGHTFORCE ATACR 4-16x42mm scope looks, feels and operates as though it was part of the AR15.

Tom Bulloch AR15 Riflescope Review

“You can’t easily see the difference between a $500 AR15 riflescope and a $2500 model. But ultimately, you’ll realize the difference. A modern variable-power AR15 riflescope has over 100 individual components. The inherent quality of those parts, the precision with which they are machined, and the care with which they are assembled are the primary reasons why a really good scope carries a high price tag…and why that price is justified.”

Tom Bulloch

Buy one scope, shoot all conditions – An investment in your shooting future

Never has there been an all-in-one scope specifically for the AR15 carbine. You will find hundreds of AR15 optics on the market – some as cheap as $20, but there are not many that measure up to the quality of the NIGHTFORCE ATACR is one of the best AR15 rifle scopes for sale.

NIGHTFORCE ATACR 4-16x42 hunting riflescope

New technology to keep you on target

The multi-advanced reticle selection allows for a selection of brightness intensity adjustment and color changes to suit the individual as well as the particular mission. Adjustments are intuitive and feature non-slip knurled knobs with positive action.

While the NIGHTFORCE ATACR 4-16×42 scope is a perfect match for the AR15, it certainly suits any mid-range caliber for hunting, combat or competition shooting.

Building A Better AR15 Rifle Scope

NightForce: Better by design

The slim, form-fitting designed blends perfectly to fit your AR15 carbine. The high quality aircraft grade aluminum is machined strong giving protection from knocks, bumps and scratches. The covers are easy to securely attach and remove, and fold back for easy one-handed reading.

High end glass – excellent low-light shooting

Nightforce has done an excellent job on this tactical AR15 scope. The glass is bright and clear while the numbers on the adjustable knobs are large, bright and easy to read. The adjustments are tactile with an absolute return to zero. The adjustments also subtended correctly, and the reticle was precise no matter the power setting.

Get the NIGHTFORCE AR15 rifle scope at today’s special price! YES I WANT IT!

Read The NIGHTFORCE ATACR 4-16x42mm Review 2016

It may be a street, a ball field or a mall parking lot. Add terrorists to the mix, and it’s even more likely. In rural environments, longer engagement distances are the norm, especially for park rangers, wildlife officers and Border Patrol agents.

When a threat arises, these personnel will have little time to calculate the range to the threat, convert the math, turn knobs on a scope and engage — all actions typical of previous doctrine.

“Even some urban environments may require a patrol officer armed with an AR 15 to deal with shots beyond 100 meters.”

And at longer distances, red-dot sights don’t provide the ability to identify the threat let alone determine the range. Given this scenario, the latest fast-action reticles mounted in medium-power optics may be incredibly useful. The NIGHTFORCE ATACR 4-16×42 may just be the best scope for an AR15 carbine.

Early fast-action scope reticles were taken from the hunting world and altered to work in combat. Horus reticles like the H58 and H59 were less cluttered and more useful than hunting versions. Ranging brackets in the H59 allow you to range, hold and hit threats when shooting as far away as 600 meters. Measurements below the centerline allow for wind holds.

NIGHTFORCE ATACR 4-16x42mm Rifle Scope

Horus’ newer TReMoR reticles when used on the AR15 enhance your speed while maintaining accuracy. With the TReMoR2, you can range and engage without ever leaving the reticle’s vertical stadia line. You estimate the wind and then hold for it using calibrated dots.

The TReMoR3 uses the same dots but moves the ranging brackets back to the horizontal line. I wanted to try this reticle out for myself, and Buck Doyle’s Follow Through Consulting offers a Scoped AR15 Carbine class that focuses on using TReMoR reticles to engage 12- inch targets out to 860 meters. You learn to control your breathing and buck the wind to make accurate shots.

NightForce tactical AR 15 rifle scope quality components

So, I needed a good optic for this class. Nightforce answered the call for an AR15 riflescope with its Advanced Tactical Riflescope (ATACR). The company offers 4-16x42mm and 5-25x56mm models with a range of reticles, and I ordered the former with a TReMoR3 reticle mounted in the first focal plane. This scope’s size and magnification make it perfectly suited to an AR15.


Nightforce’s ATACR scopes use multi-coated ED glass for excellent light-gathering capabilities and a crystal-clear picture. Etched into the first focal plane, the TReMoR3 reticle is precise at any power. My test 4-16x42mm scope offered 0.1-mil adjustments with 12 mils per revolution and 26 total mils available.

The elevation knob utilizes Nightforce’s low-profile ZeroHold feature which mated perfectly to the AR15 and has large, easy-to-read numbers. Windage can be adjusted across 18 mils (nine in each direction) via a capped adjustment knob. Parallax is adjusted on the left side.

NIGHTFORCE ATACR 4-16x42 Rifle Scope Quality

The scope has a 42mm objective with a 34mm tube diameter. The eyepiece features enhanced engraving, an integrated Power Throw Lever (PTL) and an XtremeSpeed thread for making a fast diopter adjustment. Finally, the AR15 scope came with Tenebraex flip covers to protect both lenses.

My AR15 carbine for the course was a custom Seekins Precision build with a LaRue Tactical 18-inch barrel and MBT-2S two-stage trigger installed. For ammo, I used Black Hills’ 77-grain TMK rounds, which are similar to those used by designated marksmen in the military and cycle through the AR15 seamlessly.

I mounted the scope on top of the rifle in a Nightforce Unimount to keep things lightweight yet rock solid. Installation and zeroing was simple and straight-forward. Set for proper eye relief, I leveled the scope using a plum line at 50 yards.

Nightforce Riflescope AR15

The Unimount adds 20 MOA of elevation on the AR15, allowing the scope to reach way beyond the range of the 5.56mm NATO range and ability. Setting the AR15 riflescope’s ZeroHold is pretty simple. Zero as usual and then remove the top cap.

Carefully loosen the four Phillips-head screws using the provided driver one full turn. Turn the ZeroHold plate clockwise until it stops and tighten the screws. Reinstall the cap on zero, tightening the turret screws. Press the button and you can go down a few clicks if needed.


Looking for a good AR 15 rifle scope? Now it was time for the Scoped Carbine class. After zeroing the scope, I used the TReMoR3 reticle to range a 12-inch target at 381 meters. It was easy to range, hold and pull the trigger to hit the steel. Repeating this a few times provided the chance to confirm the reticle’s wind dots.

After a few more confirming shots, we moved to the “truing” range for shots out to 760 meters with our 5.56mm’s. Using Black Hills’ 77-grain TMK ammunition, my AR15 rifle trued at 6.8 mils, shooting quite flat. This tells you whether your rifle is slow or fast, determining whether your holds are best low or high on the target.

Tactical AR15 Riflescope

Once trued to your gun and ammunition, the reticle remains accurate at most ranges, as I confirmed by ranging 12-inch steel from 300 to 500 meters. Place the target in the correct brackets, halve the number in the bottom, hold those mils on the target and press the trigger. Read the wind, and as it increases, add dots as needed.

As mentioned, the Scoped Carbine class requires using your AR15 scope’s reticle to range and engage targets out to 860 meters. The shooting ranges designed around targets at 300 meters or closer duplicate real battlefield conditions.

Once dialed in, you shoot from barricades after running between placements, and there is always wind. And those wind dots on the NIGHTFORCE ATACR 4-16×42 really helped for this portion of the course.

Range, find your hold, estimate the wind and pick a dot. Watch your splash (or a miss), adjust and hit. The results leaned towards this being the best AR15 riflescope for short, medium and long range shooting.

MOA Knob AR15 Scope Nightforce

Second-shot hits were pretty common, even in stiff winds. Once I got accustomed to the ATACR scope, it was fast— very fast at times. Where more precision was required, the reticle offers usual mil measurements, so it really does it all.

The TReMoR3 reticle was a good choice for me – one of the top AR 15 rifle scopes on the market. Initially the dots looked “busy,” but after a little time behind the scope, I saw how fast and easy it was to use the reticle.

Nightforce rifle scope rings, mounts, bases.

By the end of the second day of training, I was ranging, holding and getting first-round hits on steel from 300 to 700 meters regularly from my AR 15 223 rifle scope combo.

For those accustomed to the H59 reticle but looking for a bit more speed with fast wind holds, the TReMoR3 is the ticket.

But, of course, there is no magic here. You need to true your rifle and ammunition to get repeatable hits. After you do that, this scope/reticle combo is very consistent! Click to see more AR15 Rifle Scopes.

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AR15 first-round hits out to 860 meters with a 4-16x42mm scope! NIGHTFORCE ATACR 4-16x42 SCOPE AR15 RIFLESCOPE SPECIFICATIONS OBJECTIVE: 42mm MAGNIFICATION: 4-16X TUBE DIAMETER: 34mm OA LENGTH: 12.6 inches WEIGHT: 30 ounces EYE RELIEF: 3.35-3.54 inches EXIT PUPIL: 10.3mm at 4X; 2.7mm at 16X FIELD OF VIEW: 26.9 feet at 4X; 6.9 feet at 16X ADJUSTMENTS: 0.10 mils per click RETICLE: TReMoR3 MSRP: N/A Read why the NIGHTFORCE ATACR 4-16x42 scope is the best choice for your AR15 rifle. The NIGHTFORCE ATACR 4-16x42 scope with TReMoR3 reticle is the perfect match for all occasions. The Best AR15 Tactical Rifle Scopes…

Best AR15 Scope

An all-rounder that's solid with precision optics - the NIGHTFORCE ATACR 4-16x42mm Rifle Scope is a perfect match for your AR15.

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