4 Best Red Dot Sights For GLOCK 43X MOS

swampfox sentinel red dot on glock 43x mos

Many people ask what optics fits the G43X MOS and what don't.

In this guide, let's take a look at the best red dot sights for Glock 43X MOS that are compatible right out of the box.

For those researching which G43 models to buy, this guide helps you decide if the MOS model is the right choice for without dealing with compatibility issues later.

Let's check them out

Best MRDS Compatible For G43X & MOS Version

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racking trijicon rmrcc on wood

Referenced PDW

Highly recommend milled slide mount instead of 43X MOS, because it doesn't fit the MOS model with RMSc footprint

Why pick the NEW RMRcc - Built from the same grade features as the original RMR, the RMRcc is thinner and more compact for micro sized single stack CCW pistols.

Even through the optic window is slightly smaller than the RMR, but target acquisition speed feels still the about same without any significant compromises.

Reduced 0.2" for slimmer profile - Fits flush with G43's slim slide profile. highly recommend milling the slide for this optic so it's deep seated on the slide for durability.

No to accidental brightness adjustment - Accidental brightness adjustment is a problem when it's time to draw the gun either too dim or too bright. The new Button “LOCK-OUT” Mode secures the setting regardless of bumping or rubbing against clothing when concealed.

No compromise in durability - Even though the sight is scaled down from the original RMR, the new RMRcc still uses the same grade material, circuitry, functionality and positive MOA adjustment control the RMR is known for

Upgraded electronics - Ruggedized battery contacts and electronics ensure performance and survivability in harsh environments, the tighter battery grip prevents the battery from getting lose due to drops, bumps or repeated recoils

CHWPS Filler Adapter Required For Perfect Co-Witness! Buy Here

Holosun 507K X2 - Best Overall

holosun507 k x2 unboxing inside

Highly recommended milled slide mount for the BEST fit & deep seated on the slide. For factory MOS model CHPWS filler plate required

Or Modify the MOS slide to properly fit the Holosun 507K

Why people love Holosun 507K – The micro size Holosun 507K is made for slim profile handgun, which has flush fit on the Glock 43X slide without sticking out on the sides.

Aside from the obvious low profile design, it's a much better option than the $660 Trijicon RMRcc for the price and mounting compatibility

Snag free holster draw performance - The NEW Holosun 507K is the next generation micro red dot specifically designed for conceal carry, The rugged exterior housing to withstand wear against clothing and also provides snag-free draw performance out of IWB or OWB holsters.

Activates via motion sensor - Want to save more battery? the Holosun ShakeAwake technology instantly activates the reticle upon sensing motion & deactivates when not in motion to save more battery juice.

Simple battery change without hassle - Access the battery from the side tray instead of the bottom to eliminate the need to remove the sight for a battery swap.

CHWPS Filler Adapter Required For Perfect Co-Witness! Buy Here

Shield RMSc (Aluminum Body) - Lowest Profile


Why use Shield RMSc – The RMSc shares the same mounting footprint as the original RMS red dot, and it fits the Glock 43X right out of the box.

In addition, it's something unique other than Trijicon & Holosun. It’s slimmer so it mounts flush to both sides of the slide without lateral overhang.

The Shield RMS is used with the British regular army and Special Forces, as well as US, Australian, New Zealand Special Forces and other NATO forces. Also used by competitive sports men and women across the globe.

Perfect for single stack pistols - Fits flush on the Glock 43X's slide with its skeletonized body aluminum housing. Looks great, feels great and built tough.

Polymer glass optic for endurance - Parallax free, clear polymer optic, which can withstand up to ten times greater shock impact than products using glass optics. The RMS is designed without a red reflective filter on the lens to ensure minimal visual signature

Super lightweight - The optic only weighs 0.57 oz with 1 battery installed, which makes a great concealed carry option.

Powered by one CR2032 battery - The battery lasts about 2-3 years (recommended to switch out every year).

4 or 8 MOA size dots - Two MOA reticle sizes to pick from, which are both great for fast target acquisition. 4 MOA dot is recommended.

Holosun 507C (Special Mount Needed) - Best Full Size RDS 

Holosun 507c on glock pistol USPSA

Why this might be a better option than Trijicon RMR - If you are still not sold on the newest Holosun 507K or RMRcc, and you want to stick with the full size micro red dot, the good news is that you can mount it on the Glock 43X, but you might need a special adapter plate.

Shares the same RMR mounting footprint - One thing people love about the Holosun 507C is that it shares the same mounting footprint as the RMR, so if you have want to try the Trijicon RMR or Trijicon SRO later you don't have to buy a different optic plate.

Multi-reticle system - Each reticle pattern gives the shooter different aiming performance for different shooting applications, and the shooter can switch among:

  • 2 MOA Center dot
  • 32 MOA circle
  • 32 MOA circle + 2 MOA Dot

*Change by pressing the minus button for 3 seconds.

32 MOA circle helps significantly for picking up the sight faster because it's big and easier to see.

2 MOA center dot is great for general shooting including long distance shooting without the 32 MOA circle obstructing the target sight picture.

For the cost of this optic, you can get almost 2 Trijicon RMR’s. The battery life is great, and you will not disappoint.

Tyler Brown

Tyler grew up in a firearm family, and now he runs his own firearm business in the Midwest. 4 years of experience managing an FN dealership with tons of firearm business & product knowledge