Best Red Dot for Glock – Double Stack and Slimline Options Reviewed

Share this article:

Best Red Dot For Glock

Are you currently considering adding a red dot sight to your Glock handgun? If so, you’ve come to the right place. We’ll be reviewing the best red dots for Glock pistols.

As you are probably already aware, a red dot is a short-to-midrange shooting optic designed to improve target acquisition and accuracy over iron sights. Red dots initially found favor with rifles and carbines, and it was only a matter of time before they became prevalent on everyday carry pistols.

Additionally, adding a red dot to your Glock can help you improve your defensive shooting skills. Success in this requires two things: 1. Selecting a high-quality red dot, and 2. Lots of shooting practice.

We’ll talk about the former in this article.

In this guide, we’ll cover the best red dots available on the market today for a Glock pistol. We’ll also discuss the difference between red dots for double stack and single stack Glocks, and we’ll dive into whether you should go with an MOS Glock out of the box or mill an existing non-MOS slide to accommodate a red dot.

Without any further ado, let’s get started:

Double Stack vs. Single Stack (Slimline)

In this guide, we’ll discuss red dots for both double stack and single stack Glocks. It’s important to note that red dots designed to fit double stack Glocks will not fit your single stack Glocks and vice versa.

Double stack Glocks include models such as the 17, 19, 19X, and the 26, while single stack (or slimline Glocks) include models such as the Glock 42, 43, 43X, and the 48 (for the sake of simplicity, we’ll stick to 9mm models in this article).

As a general rule, red dots designed to fit single stack pistols are referred to as Micro Red Dots. These are simply very small red dots with a smaller footprint than larger pistol red dots.

Micro red dots can be tricky because oftentimes, the documentation for specific micro red dot products won’t contain information about its compatible footprint (depending on the model). This forces you to do greater research online to determine if your specific micro red dot is compatible with your particular model of Glock. Some specific micro red dot models, like the RMRcc, have their own unique footprint and thus require a specialized MOS or slide milling to be installed to your Glock.

As a general rule, there are four reflex sight footprints that offer cross-compatibility. These are as follows:

Footprint A: Trijicon RMR, Holosun 507CX2
Footprint B: Shield RMSc, Holosun 507KX2
Footprint C: SIG Sauer Romeo 1, Crimson Trace CTS_1250, Leupold Delta Pro
Footprint D: Vortex Venom and Burris FastFire

MOS Version vs. Slide Milling

There are two primary ways to install a red dot on your Glock pistol. The first is to use an MOS (Modular Optic System) Glock model, ready to go to have a red dot installed right out of the box. The alternative is to mill an existing non-MOS slide. Technically, there’s a third option, which involves attaching a mount to your rear sight dovetail, but please just don’t ever do that.

The fitting on an MOS Glock is very secure and designed to prevent debris from entering underneath the plate. The slide is already cut to permit interchangeable red dot mounting plates to be installed. Between the two, buying an MOS Glock is more convenient and saves you potentially weeks of waiting to ship your slide off for milling.

There are five different Glock MOS plates available:

Plate 00: the base cover plate installed as default from the factory (no red dot)
Plate 01: Fits EOTech, Insight, and Meopta red dots
Plate 02: Fits Trijicon red dots
Place 03: C-More red dots
Plate 04: Leupold red dots

But going with a milled slide allows the red dot to sit lower and provides a better fit since you can custom-mill the slide to the footprint of your red dot of choice. This also means you can gain a lower profile with your red dot since you can cut deeper into the slide. This achieves a better co-witness so you can also line up your iron sights through your red dot.

Best Red Dot For Glock Double Stack Models

Here, we’ll do three reviews on red dots best fit for double stack models:

Trijicon RMR Type 2

The first double stack Glock we’ll look at today is the Trijicon RMR Type 2. Trijicon is one of the most renowned brands in the red dot industry. This is a very rugged red dot design thanks to its military-grade aluminum alloy construction and the fact that the basic housing shape of the red dot is designed to divert an impact against a hard surface away from the lens.

This is a 3.25 MOA adjustable LED red dot that offers eight different brightness settings that are easily adjustable with a push button. When operating on the fourth setting or a lower brightness level, the Trijicon RMR Type 2 can power continuously for up to four years. However, it automatically adjusts to ambient light conditions after sixteen hours of non-use.

Trijicon RM06-C-700672 RMR Type 2 Adjustable LED Sight, 3.25 MOA Red Dot Reticle, Black
  • 3.25 MOA
  • Military-grade aluminum alloy forged housing
  • Battery conservation mode automatically adjusts to ambient lighting conditions after 16 1/2 hours have passed
  • Offers four years of continuous use at the Setting 4 or lower mode
  • Holosun 507c X2

    The following double stack Glock red dot we’ll look at is the Holosun 507c X2. Compatible with the Trijicon RMR footprint, the 507c X2 is constructed out of 7075 T6 aluminum and comes with a lithium-ion battery that offers up to 50,000 hours of battery life.

    Another distinguishing feature of the 507c X2 is the Lock Mode, which locks up all the buttons on the device when activated. This prevents accidental setting changes, which could happen under stress or duress.

    Another neat feature of 507c X2 is the solar ‘failsafe’ feature. This feature means that the red dot remains powered even when the battery has failed, and the settings will be adjusted automatically according to current lighting conditions.

    HOLOSUN HS507C-X2 Classic Multi Reticle Red Dot Sight, BLACK
  • 2 MOA dot + 32 MOA circle
  • Powered with a lithium-ion battery offering 50,00 hours of battery life
  • Has a solar 'failsafe' feature that continues to keep the red dot running even when the battery fails
  • Lock mode locks all of the buttons and stops accidental setting changes
  • Shuts off automatically following extended periods of inactive movement
  • Compatible with the Trijicon RMR footprint
  • Constructed out of 7075 T6 aluminum
  • Holosun 508t X2

    Another red dot we’ll look at from Holosun is the 508t. This is almost the same red dot as the aforementioned 507c X2, with the primary difference being the overall size and construction. The 507c was built out of 7075-T6 aluminum, whereas the 508t is built out of titanium (hence the ‘t’).
    As with the 507c, the 508t also comes with a solar ‘failsafe’ feature, which means the red dot remains activated even when the battery has failed; the settings adjust automatically to present lighting conditions when this feature is activated. The lithium battery also offers over 50,000 hours of battery life.

    Holosun HE508T-RD-X2 Titanium Multi-Reticle Circle Dot Open Reflex Sight w/Solar Failsafe & Shake...
  • 2 MOA dot + 32 MOA circle
  • Durable titanium construction with anodized finish
  • Windage and elevation adjustments are held inside the sight housing
  • Waterproof in one meter of water for up to thirty minutes
  • Offers 50,000 hours of battery life
  • Solar 'failsafe' feature continues to keep the red dot running even when the battery fails
  • Best Red Dot For Glock Single Stack (Slimline) Models

    Here, we’ll do three reviews on red dots best fit for single stack models:

    HOLOSUN - HS507K-X2

    The first red dot for a single stack Glock that we’ll take a peek at is the Holosun HS507K-X2. As with other Holosun red dot models we’ve discussed, the HS507K-X2 comes equipped with a lithium-ion battery offering 50,000 hours of overall battery life. A ‘lock mode’ locks all of the buttons so that none of the buttons can be accidentally pressed, which is a significant factor to consider when the operator is under duress.

    The lenses of the HS507K-X2 are manufactured with multilayer coatings over an optical glass construction, which encourages greater light transmission while keeping glare to a minimum. Meanwhile, the ‘shake awake’ feature of the HS507K-X2 shuts the LED off when the site is not in use but automatically switches back on immediately after motion. This feature also brightens the reticle when the red dot aims at the sun or bright light, so it’s more easily viewed.

    Holosun HS507K-X2 Compact Multi-Reticle Circle Dot Open Red Dot Sight w/Shake Awake HS507K-X2
  • Lock mode stops buttons from being accidentally pressed
  • Multi-coated lens helps improve light transmission and reduce glare
  • 50,000 hours of battery life
  • 'Shake awake' feature shuts off the red dot when not in use, reactivates under motion
  • Aluminum construction
  • Trijicon RMRcc

    The Trijicon RMRcc is a small red dot designed to fit on many small concealed carry pistols, including single stack Glock pistols like the 43X and the 48. This is a 3.25 MOA red dot that offers 3 MOA per click.

    Constructed out of high-quality aircraft-grade aluminum, the RMRcc has a unique housing shape patented by Trijicon that is designed to redirect the force from an impact against a hard surface away from the lens to help increase durability over the long term.

    The RMRcc offers eight different brightness settings, one of which Trijicon calls the ‘super bright’ mode, and two night vision modes designed for night and low light conditions.

    Trijicon RMRcc Sight Adjustable LED Red Dot, 3.25 MOA, Black, 3100001
  • 3.25 MOA
  • Offers eight different brightness settings
  • Built out of aircraft-grade aluminum
  • Housing is designed to redirect the force of an impact against a hard surface from the lens
  • Holoson HS407k-X2

    The last red dot we will look at is the Holoson HS407k-X2. This red dot offers 50,000 hours of battery life thanks to its lithium-ion battery. There are twelve unique brightness settings, with the seventh level being the default setting when you open up the HS407K-X2 out of the factory box. The lowest settings are designed to be utilized with night vision devices.

    The HS407K-X2 also comes with a ‘shake awake’ technology from Holosun that shuts off the device when it’s not being used but automatically switches it back on when it detects motion. The device is user programmable regarding how long you want it to take to shut off and ‘sleep’ during motionless periods.

    Holosun HS407K-X2 Compact 6MOA Dot Only Open Reflex Sight w/Shake Awake HS407K-X2
  • 6 MOA
  • Offers 50,000 hours of battery life from lithium-ion battery
  • Offers twelve different brightness settings
  • 'Shake awake' technology shuts off the red dot when it's not being used
  • Aluminum construction
  • Conclusion

    As you can see, both Trijicon and Holosun are top contenders for red dots for both double stack and single stack Glock pistols. Any one of the red dots that we have covered here today will be an excellent option for your Glock because of the ruggedness, durability, and longevity they possess when it comes to battery life.

    As one final piece of advice, remember that what’s ultimately just as important as choosing a high-quality red dot is to practice. A red dot can improve your accuracy and target acquisition with a pistol, but only with practice. Practice drawing your (unloaded) Glock from your carry holster and lining up the red dot on your target at home, and invest in plenty of boxes of target ammo so you can hit the range and practice for real on the firing line.

    Written by:

    Leave a Reply