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AR-15 scopes are no longer a novelty. The military has used them since before the War on Terror and recreational shooters and hunters have made them a standard part of their rifle build. For modern shooters, the world is their oyster when it comes to optics, given the sheer number of AR rifle scopes on the market. Today, I’ve gathered our picks for great optics to use on the AR-15 rifle, subdivided into three separate categories: short-range, medium-range, and long-range.
Before I begin, though, several presumptions informed all my picks for the best AR-15 scopes. Firstly, I’m operating under the presumption that your AR-15 is chambered in 5.56×45 NATO or .223 Remington rather than a more exotic caliber like .300 AAC Blackout or 6.5 Grendel. Secondly, when I refer to the range, I’m referring to the capabilities of the 5.56 cartridge. In this context, short-range traditionally means less than 200 yards, medium-range means 200-400 yards, and long-range is anything over 500 yards (when 5.56 loses supersonic velocity and becomes less precise). Finally, the options in this article were selected with the serious leisure shooter, competitive shooter, and hunter in mind.
All of the suggestions on this list are based on expert input from competitive shooters, military personnel, and firearms historians, and are popular throughout the shooting world due to their performance, user-friendliness, and value for the price, which means that if the scope costs $2,000, there’s a very good reason.
Best Short-Range AR-15 Optic
EOTech EXPS3 Holographic Weapon Sight
Best Mid-Range AR-15 Optics
Trijicon TA31 ACOG 4×32
Best AR-15 Scope for Long Range
Vortex Razor HD Gen III 1-10×24
Why you should trust us
For this article, I considered a variety of expert opinions on what makes a good AR optic. My findings were based on my professional and personal experience in shooting sports as well as the expert opinions of other serious shooters and credible hobbyists. While I conducted in-person interviews with those much more knowledgeable on optics than myself, I relied on product testing published by InRange TV and 9-Hole Reviews.
Types of AR-15 scopes
AR optics fall into four major categories: red dot, holographic, fixed-power, and variable power. Each one offers significant advantages and disadvantages that are endemic to the platform and should be considered when buying a new optic. Here’s a breakdown of these optic types, how they work, and a summary of their advantages and disadvantages.
Red dot
Red dot optics are the simplest optics on this list. They produce the reticle by projecting a simple colored LED light onto a pane of glass. The light can be filtered through a shaped aperture, which can allow for red dots with things like crosshairs, ACSS reticles, and chevron reticles.
In general, the advantages of red dots are that they are extremely durable, can be made incredibly small, and have incredibly long battery lives, sometimes stretching well into tens of thousands of hours.
Disadvantages of red dots are that the light can appear streaked or starburst for those with astigmatism, total loss of capability if the battery does go out, and reticle scaling under magnification, meaning that if you magnify a red dot, the dot gets bigger, which can take up more of your field of view.
Holographic
Holographic sights work by projecting an image with lasers between two mirrors and two panes of glass, causing a reticle that “floats” in front of your weapon when viewed through the hologram window.
Holographic sights have the advantage of being mostly unaffected by astigmatism in the shooter’s eye. They also have very crisp reticles that are unaffected by magnification, meaning it magnifies the image but not the reticle, so you can be more precise with your aim.
The disadvantage of holographic optics is that they project a holographic image with laser energy, and so they consume significantly more battery power than red dots, oftentimes with one-fiftieth battery life. Another disadvantage is that they’re usually significantly larger, due to the more complex emitter.
Fixed-power
Fixed-power optics do not change magnification levels, and while technically you could argue that red dots and holographic sights are fixed power, I’m using fixed-power to mean lensatic optics with an etched reticle, which includes unmagnified optics like prismatic optics that can take the place of a red dot.
Fixed-power optics have several advantages, namely that due to their etched reticle, they do not require battery power to work, and their reticle image will be overall more precise. Additionally, they will often have an improved field-of-view and clarity over variable-power optics, with their lens geometry being precisely engineered for a single magnification level. They may feature illuminated reticles as an option, and many high-magnification precision optics are fixed-power.
Their primary disadvantage is their lack of flexibility at different ranges, meaning that optics with a high enough magnification level are effectively unusable at closer ranges, and vice versa.
Variable-power
Variable power optics are similar in construction to their fixed-power brethren in that they use lenses that feature etched reticles. The key difference is that they can toggle through magnification settings to address different ranges. They come in two major varieties: first focal plane, and second focal plane.
The first focal plane offers a scaling reticle that increases in size as you zoom in. It’s useful for shooters who want reticles that reveal finer detail when zoomed in, which can be useful when shifting from low magnification where a coarse optic is needed, to high magnification when things like wind call grids and bullet drop compensators become more relevant.
The second focal plane has a reticle that does not change size even as magnification is changed. It’s useful for shooters who want to maintain visual similarity of the reticle across all magnification levels, and who understand that they will have to do mental math to convert measurements depending on the magnification level.
One advantage of variable power optics is that they allow you to have a single optic that can be used at multiple distances without needing offset red dots, re-zeroing, or backup iron sights. Another advantage is that they can allow you more magnification than you typically need at a certain distance. This allows for improved visibility to ensure, for instance, you’re indeed about to shoot a coyote hiding in the brush and not a young fawn.
The disadvantage of variable power optics is that they’re oftentimes more expensive, heavier, and larger than equivalent fixed-power optics. Also, lower-end options can experience visual distortion at different magnification levels.
Key features of AR-15 scopes to consider
Magnification level or “power”
The magnification level of an optic represents how many times the image will be magnified before hitting your eye. Lower magnification levels can offer an increased field of view with the tradeoff of their image magnification not being as strong.
Objective lens diameter
The objective lens is the lens that faces the target, or the front lens. The diameter of the objective lens determines how much light the scope takes in. It’s represented numerically by the second number on the scope’s specification. For example, a rifle scope listed as “4×32” means the objective lens is 32mm in diameter. A larger objective lens, which will let in more light, is optimal for shooting at dusk or in lowlight conditions from a stationary position.
Adjustment turrets
The adjustment turrets on an optic allow the shooter to zero their optic by moving the reticle, usually with a tactile click that represents a certain number of minutes of angle. In general, the knob on the side of the optic will adjust windage while the one on top adjusts for elevation. You also used these knobs to make adjustments as needed.
Eye relief
Eye relief is the length between the shooter’s eye and the viewing lens of the optic when a target is in focus. The distance can be less than an inch to almost one foot. While it’s largely a matter of personal preference, it is something to consider when mounting a scope.
Parallax
Parallax is one of those things that’s easier to see than explain. Essentially, it’s when the reticle moves (even if the scope and rifle are stationary) because you changed your point of view. It happens when your POV and scope’s POV aren’t perfectly aligned.
AR-15 scope pricing considerations
Low
The low end of the pricing scale for optics is less than $500. This is where you’ll find a lot of inferior optics, but certain brands like Holosun and Primary Arms produce optics that are of decent quality for beginners. Avoid large magnified optics in this price range
Medium
This medium price range runs between $500 and $1000. This is where you’ll find quality red dots and holographic sights, and lightly used or discounted fixed power optics like the ACOG. You will also find entry-level LPVOs and precision optics. However, these are usually of inferior quality and will often have issues such as poor light transmission, edge warping, poor recoil resistance, and wandering zero.
High
At more than $1000, the high-end of the price section has no upward limit and in this area, you’ll find quality magnified optics of many types, ranging from the ACOG to premium optics from Schmidt and Bender, Nightforce, Steiner, and Leupold that can cost more than $4,000. In this range, you’ll pay dearly, but you’ll be getting optics that are on the cutting edge of technological development, and that you can count on to help you get rounds on target, usually also covered by great warranties and customer service.
How we chose our top picks
For this article, the reviewed rifle scopes for how well they work when shooting at short-, medium-, and long-range targets. In other words, we didn’t access them for niche capabilities like how well they work with night vision or thermal. This allowed us to keep this list clear and concise, and give the reader an easy-to-understand guide for buying a premium optic.
FAQs on AR-15 scopes
Task & Purpose answers to the most commonly searched questions on the Internet on this topic.
Q. What optics do the Navy SEALs use?
A: Navy SEALs use many different types of optics, including the optics that were listed here. The EoTech EXPS in particular has been spotted in heavy rotation since its inception. However, no list is ever going to be truly comprehensive, given the dizzying speed at which new optics are developed and adopted among special operations forces.
Q. What is the clearest rifle scope?
A: In my personal experience, Trijicon has produced some of the clearest magnified optics out there, with both the ACOG and VCOG providing gloriously sharp images and great light transmission that’s comparable with the naked eye. This should be taken with a grain of salt because I’ve never had the chance to look through something from Schmidt & Bender or anything of that caliber.
Q. What is an LPVO scope?
A: Low power variable optics (LPVO) are optics that feature a relatively low maximum magnification, but allow you to cycle through magnifications to get a sight picture that fits the task and hand. Whether they’re older types like the Elcan Specter, or the latest 2.5-8x optic being fielded by the Marine Corps on the M38 Squad Designated Marksman Rifle system, LPVOs are excellent when you expect to engage targets at a variety of unpredictable distances.
Q. What magnification is needed for AR-15 scopes?
A: The magnification needed will change based on the task at hand. In general, I’ve found that unmagnified optics are capable for addressing targets less than 100 yards away; 4x magnification for 300 yards; and 8x or higher for 500 yards or more. If you anticipate engaging targets at a wide variety of distances, it might be worth it to shell out for a quality LPVO, which gives you the flexibility to adjust the magnification on the fly.
Q. Why do you need fancy optics? Back in my day we shot iron sights on the M16A1 and we liked it! This new Corps…
A: OK, Boomer.
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Matt Sampson is a Task & Purpose commerce writer. An 0861 in the Marine Forces Reserve and a Virginia native, he worked in tactical gear retail in his past life and is an avid firearms enthusiast. The farthest the Marine Corps has sent him from home is California.