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Complete Guide to AR-15 Red Dot Sights
In Guide by Jim
Types of Red Dot Sights
Red dot sights are a general term to describe any type of optic that uses a dot (typically from a red LED) to establish an aiming point. Of course, the color can vary as well as the aimpoint symbol (reticle), so instead of a red dot, it can be a green dot or even a crosshair to provide an aimpoint for the shooter.

In simple terms there three major categories of Red Dot Sights:

Reflex Sights (which have two sub-categories)
Exposed Reflex
Tube Style Reflex
Prism Sights
Holographic Sights
1. Reflex Sights

Reflex sights are the most common and least expensive category of red dot sights. They are called reflex sights since they use a reflection of a dot or some type of aimpoint on a lens that the shooter looks through to aim. They are typically non-magnified and will either be exposed, also known as windows (single lens), or inside a tubular housing (typically multiple lenses).

Exposed Reflex Sights
The square, exposed red dot sights (like the Burris Fast Fire above) offer a wider field of view for most shooters. Using the two eye aiming method, there is simply less to interfere with your vision. These open sights are often less bulk and often lighter.

Tube-Style Reflex Sights

The benefits of the tube-style (like the Vortex Sparc 2 above) is a more durable, and protected optic. Tube sights are often capable of suffering more abuse than an open sight and are often more waterproof. The tube design, for the most part, is not heavy, but tube styles are often heavier than comparable open sights.

Both the exposed and tube style reflex sight generally use batteries to provide the dot, although sometimes the tube style reflex may use tritium, a beta-emitting radioactive isotope of hydrogen that emits light. Don’t worry, it’s safe!

Reflex Sight Pros and Cons
Unlimited Eye Relief

Unlike other sights, non-magnified reflex red dots have unlimited eye relief. This means there is no set distance you need to have your eye from the sight. Other types of optics require your eye to be a set distance whenever you intend to use it.

Parallax Free
Reflex red dots are nearly parallax free, this means when you move your head around, the red dot moves with you so you’re still pointed at the same spot. This is really nice and allows you to keep both eyes open while using the weapon making it easier to acquire your target. This is unlike other optics that require your face to be a specific distance from the optics every time you shoot to have accurate results.

Cost
Reflex sights are generally less expensive than other types of red do sights. Like most things, depending on your budget you pay a lot or a little. See my recommendations at the bottom based on your budget.

Magnification
Reflex sights are typically non-magnified making them better suited for close range shooting, often 100 yards or less.

However, you can try to have the best of both worlds by using a flip-to-side magnifier that goes behind your red dot. This allows you to quickly flip up the magnifier when you want to take a long-range shot and then flip it out of the way for close range shots.

VORTEX OPTICS VMX-3T MAGNIFIER

Another option is to mount a red dot reflex sight on top of your scope allowing you to switch between the two depending on the distance of your shot.

2. Prism Sights

Prism sights (like this Vortex Spitfire 3x) are typically a short tube style optic with low levels of magnification making them better for longer range shooting compared to non-magnified reflex sights.

Rather than using a series of lenses like a traditional rifle scope, a prism sight uses a prism to focus the image you see down the sight making them smaller than the traditional rifle scope. Prism sights are ideal for the average target shooter or distance shooter.

Prism Sights Pros and Cons

Magnification
As stated, one of the nice features of prism scopes is that they are typically magnified making it easier to hit your target further down range. They are also available with illuminated or etched reticles adding to the experience of shooting your AR.

Short Eye Relief
The biggest issue with prism sights is that they have shorter eye-relief, which means that your eye has to be closer to the optic to have a proper sight picture, just like a traditional rifle scope. This short eye-relief can make it difficult to reacquire your target.

Cost
Prism sights are somewhat more expensive than reflex sights, however, the prices are consistently dropping as time goes on making them an affordable option.

3. Holographic Sights

Holographic sights (like this EOTech 512.A65) are not as common as reflex sights or prism sights typically due to the higher price tag. They are similar to exposed reflex sights in what they offer for field of view and target acquisition only better in quality.

A holographic sight uses a picture of a reticle that is in between glass layers that allows the shooter to look through a glass window and see a holographic reticle superimposed at a distance. The hologram of the reticle is built into the window and is illuminated by a laser.

This is similar to the technology that fighter pilots use for target acquisition. It creates an accurate image of a target even in poor-visibility conditions like rain, snow, darkness or cloud cover.

Holographic Sights Pros and Cons
Peripheral Vision and Target Acquisition
One of the biggest benefits of this type of sight is the ability to maintain your peripheral vision while shooting, because of this you ideally want to mount an EOTech toward the front of your receiver. Mounting it to close to the back of the receiver will prohibit you from having this large advantage.

The heads-up display of a holographic sight allows the shooter to keep both eyes open while shooting. This eliminates blind spots and tunnel vision.

Accuracy & Quality
There’s a reason that EOTech holographic sights are so popular with the United States military. EOTech sights are very precise and will allow for more accurate shooting over long distance. Typically the reticle dots in EOTech sights are 1MOA which means that at 200 yards the dot is going to take up 2 inches on the actual target.

Cost

Most holographic sights will be several times more expensive than a good quality reflex sight, although the prices have dropped a lot over the years. In the end, you’re paying for reliability, a clearer dot, better weather resistance, and better shock resistance.

Important Considerations When Buying A Red Dot Sight
Recoil and Caliber Specific Optics

Even though red dot optics are actually simple devices, it is still important to consider what weapon and what caliber that weapon is when selecting your optics. Some red dots feature marked reticles for specific calibers which means if you are running an AR-15 in 458 SOCOM, know that a sight with reticle marks for rifles running 5.56 will not be accurate.

A problem that may be encountered with small budget red dots is recoil. If you are using a weapon that has more recoil than the optic is rated for you may have problems with the sight holding your zero. There are many cheap red dots available under a $100 that have mixed reviews. You may get lucky with one of these or maybe you won’t. I prefer to buy once and cry once.

Battery Life
Battery considerations come down to two main issues. types of battery, and battery life. With some many red dots available, and made by different manufacturers, those batteries vary wildly between companies. As a shooter, you should examine any other electronics mounted to your rifle and attempt to consolidate to a single battery source.

Another issue is battery availability, some sights use weird and difficult to acquire batteries.

Reticle Size
Most red dots are measured in MOA, or minute angle. A 1 MOA red dot is 1 inch in diameter when aiming at something 100 yards away, 2 inches at 200 yards, 3 inches at 300 yards, and so on and so forth. Red dots are available with 1 MOA dots like on the center of an EOTech or much, much larger.

https://cdn.shopify.com/s/files/1/0231/2927/files/red_dot_reticles_large.jpg?34093

It makes sense that a smaller reticle is better for placing precise shots at longer distances. The dot will cover less of your target making it much easier to pick your aimpoint. The downside is that a small dot is less ‘eye-catching’, and more difficult to see. This is especially true in areas with extremely bright daylight although many higher quality models allow you to adjust the brightness.

Red Dot Sights and Astigmatism
Maybe you purchased your first red dot sight and notice your dot is blurry or star-shaped. You may have an inexpensive or defective optic, however most cases this occurs due to the shooter having an astigmatism.

IF YOU HAVE AN ASTIGMATISM THERE ARE A FEW THINGS TO TRY TO IMPROVE THE BLURRY DOT YOU ARE SEEING.

An astigmatism causes light to refract to multiple focal points in your eye, so it is possible to reduce blurriness or irregularly shaped dot by reducing the amount of light going into your eye from the red dot.

Here are some options that may consider:

Reduce the brightness setting on your red dot
Focus on the point of impact on your target rather than the red dot
Use the peep on your backup iron site and red dot at the same time
Wear polarized sunglasses
If none of these options improve your dot shape and blurriness, you may want to consider a prism or holographic sight mentioned above since many shooters with astigmatisms report better results than with using reflex sights.

Price
Everyone comes to the market with a different budget. What you desire in your sight and how much you can afford will largely determine which optic you go with. Below are several great starting points based on different price ranges, check the reviews for yourself.

Best AR-15 Red Dot Sights for the Money: $50 to $500
Best Budget Red Dot Under $100: Bushnell TRS-25

Best Red Dot Under $200: Vortex Optics Sparc AR Red Dot

Best Red Dot Under $300: Vortex Sparc AR 2 *Editors Pick*

Best Red Dot Under $400: EOTECH 512.A65 Tactical HOLOgraphic

Best Red Dot Under $500: Aimpoint PRO

Why Use a Red Dot Sight Over a Scope?

All weapons should be looked at as tools for specific jobs which means you need to have a goal or purpose when outfitting your AR. If you are looking to ring steel targets at 1000 yards, a red dot sight is not the tool you want or need.

Most red dots are 1x magnification making them ideal for shorter distances, although this mainly depends on the shooter. One of the main reasons you would select a red dot sight for your AR-15 is speed and quick target acquisition. If you want to pop off a lot of rounds quickly and accurately, a red dot sight is a way to go.

Lastly, a red dot sight will typically weigh less than a scope and will be far easier to acquire your target without dealing with eye relief.

Conclusion
One of the best ways to simplify your shooting experience while making it far more enjoyable and rewarding is using a red dot sight. Maybe you are a new shooter that just thinks they look cool (and you’d be correct) but don’t know where to start, or maybe you are a longtime shooter looking for other options and information, I hope this has been helpful!

--------------------
John aka NitroX

...
Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"

Edited by NitroX (30/06/23 05:12 AM)

https://www.opticsplanet.com/holosun-hs507c-x2-red-dot-sights.html

Holosun HS507C-X2 Reflex Red Dot Sight, Color: Black, Battery Type: CR1632 Lithium w/ Free S&H — 2 models
4.8 rating with 116 reviews Review & Rate289 Questions & 297 Answers
Holosun HS507C-X2 Red Dot Sight, 1x, 2 MOA Dot & 32MOA Circle, Black, HS507C-X2
Holosun HS507C-X2 Red Dot Sight, 1x, 2 MOA Dot & 32MOA Circle, Black, HS507C-X2
Holosun HS507C-X2 Red Dot Sight, 1x, 2 MOA Dot & 32MOA Circle, Black, HS507C-X2Holosun HS507C-X2 Red Dot Sight, 1x, 2 MOA Dot & 32MOA Circle, Black, HS507C-X2Holosun HS507C-X2 Red Dot Sight, 1x, 2 MOA Dot & 32MOA Circle, Black, HS507C-X2Holosun HS507C-X2 Red Dot Sight, 1x, 2 MOA Dot & 32MOA Circle, Black, HS507C-X2Holosun HS507C-X2 Red Dot Sight, 1x, 2 MOA Dot & 32MOA Circle, Black, HS507C-X2Holosun HS507C-X2 Red Dot Sight, 1x, 2 MOA Dot & 32MOA Circle, Black, HS507C-X2Holosun HS507C-X2 Red Dot Sight, 1x, 2 MOA Dot & 32MOA Circle, Black, HS507C-X2Holosun HS507C-X2 Red Dot Sight, 1x, 2 MOA Dot & 32MOA Circle, Black, HS507C-X2Holosun HS507C-X2 Red Dot Sight, 1x, 2 MOA Dot & 32MOA Circle, Black, HS507C-X2Holosun HS507C-X2 Pistol Red Dot Sight, ACSS Vulcan Reticle, 7075-T6 Aluminum, Black, HS507C-X2-ACSSHolosun HS507C-X2 Pistol Red Dot Sight, ACSS Vulcan Reticle, 7075-T6 Aluminum, Black, HS507C-X2-ACSSHolosun HS507C-X2 Pistol Red Dot Sight, ACSS Vulcan Reticle, 7075-T6 Aluminum, Black, HS507C-X2-ACSSHolosun HS507C-X2 Pistol Red Dot Sight, ACSS Vulcan Reticle, 7075-T6 Aluminum, Black, HS507C-X2-ACSSHolosun HS507C-X2 Pistol Red Dot Sight, ACSS Vulcan Reticle, 7075-T6 Aluminum, Black, HS507C-X2-ACSSHolosun HS507C-X2 Reflex Red Dot Sight, ACSS Vulcan Reticle, Black, HS507C-X2-ACSSHolosun HS507C-X2 Red Dot Sight, 1x, 2 MOA Dot & 32MOA Circle, Black, HS507C-X2
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Holosun HS507C Reflex Sight User's Manual
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Questions & Answers
Seen it asked if it comes with a picatinny mount and been answered yes but description says no mount included. HS507C-X2-ACSS clarification please.
Expert Answer
This will not include a low profile Picatinny mount.

by Patrick, Gear Expert, October 6, 2021
See 2 More Answers
Will this work with the Sig P320 AXG Scorpion?
Expert Answer
It will not fit without an adapter. The P320 AXG Scorpion is machined to accept a Romeo1 PRO or Leupold Delta Point PRO. To install an RMR-pattern red dot like the Holosun 407/507 models requires an adapter that changes the mounting pattern of your slide.

by Armando R., Gear Expert, March 4, 2021
View All Q&AYou Have a Question? Ask!
Customer Reviews
Expert Review
Excellent Optic
by Jeremy, Gear Expert, July 28, 2021
I was skeptical about putting a miniature red dot sight(MRDS) on my handguns when they first came out. The process and price at the time seemed like a hassle. These days however its easy to find a milled slide or a local gunsmith who can mill your ...
Read More...
27/29 found this helpful
Expert Review
Holosun Listens
by Matt S., Gear Expert, January 5, 2021
the original 507c was a great option added to the pistol mounted RDS market. the X2 version provides the updates end users wanted: subdued logo/finish side access battery means you dont need to remove the sight to replace the battery Everything e...
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19/19 found this helpful
Helpful Positive Review
Holosun is awesome
by Jeff585, Verified Owner, November 29, 2020
Shame on Trijicon for suing Holosun. They make an overall better product at a lower price. Shake awake, auto dim, "forever" battery life, side door for battery replacement. It is a great reflex sight at a reasonable price.
74/88 found this helpful
Helpful Negative Review
Great Optic.......When it works
by Scott, January 4, 2021
I wanted to give this a good test before I reviewed the sight. I am going to make a very long and frustrating process short. I ordered a 507c, and had it about 3 months. Put about 5-7 hundred rounds through my custom Glock 17 and the center dot went ...
Read More...
54/110 found this helpful
Most Recent Reviews
Best red dot ever
by Benjamin, June 21, 2023
Works great. Vulcan feature is terrific. It replaced a Trijicon RMR dual red dot sight and is an order of magnitude better. I just love the outside ring. If the dot is not in the field when I point, I can always find it right away with vulcan feature...
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Holosun HS507C-X2 Reflex Red Dot Sight, 2 MOA Dot & 32MOA Circle Reticle, Black, HS507C-X2
Reticle: 2 MOA dot, 32 MOA circle
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Holosun HS507C-X2 Reflex Red Dot Sight, ACSS Vulcan Reticle, Black, HS507C-X2-ACSS
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--------------------
John aka NitroX

...
Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"