5 Best GLOCK 43X MOS Red Dot [Updated 2022]

Here are the 5 best Glock 43X MOS red dot sights that are compatible for factory slides or custom slides.

This guide also helps you to decide if the Glock 43X MOS is the right choice for your existing optics without dealing with compatibility issues.

Let's check them out

Best Glock 43X MOS Red Dot Sights

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Holosun 507K X2 - Best Overall

holosun 507k on glock 43 mos

Highly recommended to mill slide for the BEST fit 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 – This is by far the best optic for Glock 43X MOS. It's made for slim profile handguns, and its the same width as the Glock 43X slide without sticking out on the sides.

Rugged Exterior Housing - It's like an RMR that can withstand drop impact, and it provides snag-free conceal carry holster draw in and out of IWB or OWB holsters.

Activates via motion sensor - The Holosun ShakeAwake technology instantly activates the reticle upon 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.


  • Side battery access to load battery
  • Very long battery life
  • Features Shake awake technology
  • Small for CCW
  • Durable front lens construction


  • MOA adjustment requires a small flat head screw driver

Trijicon RMRcc - Very Long Battery Life

glock 43x with trijicon rmrcc

Why pick the NEW RMRcc - This is the same RMR quality micro red dot for Glock 43X. The RMRcc is great for micro sized single stack CCW pistols.

Reduced 0.2" for slimmer profile - Fits flush on the G43's slim slide. It works better for custom milled slide so the optic can lock in very tight.

No to accidental brightness adjustment -The new “LOCK-OUT” Mode settings secures the setting regardless of bumping or rubbing against clothing when concealed.

No compromise in durability - The new RMRcc still uses the same grade material, circuitry, functionality the RMR is known for

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

brownells glock 43 rmrcc slide

Highly recommend the Brownells RMRcc strip slide to mount the RMRcc. Get it here


  • As durable as the RMR
  • Prevents accidental button adjustment in lock out mode
  • Very long battery life
  • Very slim fit just like the Holosun 507K


  • Milling required (Doesn't fit RMSc footprint)
  • Bottom battery access

Shield RMSc (Aluminum Body) - Lowest Profile

glock 43x mos shield rmsc

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.

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 lens optic for increased durability - Parallax free, clear polymer optic, which can withstand up to ten times greater shock impact than products using glass lens 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.


  • Skeletonized body to reduce weight
  • Offers bigger dots than just 3 MOA or 6 MOA
  • Great for single stack pistols


  • A bit pricey for what it does

Swampfox Sentinel - Best Value

swampfox sentinel red dot on glock 43x mos

The Swampfox Sentinel is one of the top selling red dots at a good price point. It mounts DIRECTLY to Glock 43 MOS slide without any mod or filing.

Extra Protection - The 7075 T6 body is durable for duty carry, but it will be better to add the IRONSLIDES Shield to it to beef up the lens hood protection

Low Profile Lens Hood - Aim with both eyes open and see targets clearly 

Manual Model -  Shake ‘N Wake motion sensing preserves battery life when Sentinel-M has been still for about 4 minutes. With new motion, Sentinel-M resumes its previous brightness level. 

Auto Model - A photosensitive sensor adjusts the dot brightness relative to ambient lighting conditions. 


  • Easy to mount 
  • Holds zero
  • Affordable


  • Thin lens frame
  • Reticle may flicker when facing direct sunlight
  • Turret clicks don't have positive feedback

Holosun 507C (Special Mounting Plate Needed)

acss vulcan reticle pov

Why get this one over the Trijicon RMR - If you are still not sold on the newest Holosun 507K or RMRcc. The Holosun 507C can work with your Glock 43X. It's the go-to option now for many full size handguns and rifles. You just need a special adapter plate to make it work.

Shares the same RMR mounting footprint - It uses the same mounting footprint as the RMR. Try Forward Control Design mounting plate

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

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

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.

Please try ACSS reticle to help recenter the reticle faster if lost in the window (Buy Holosun 507C ACSS)


  • Skeletonized body to reduce weight
  • Same multi reticle system as the 507C
  • Very durable the same way as Trijicon RMR


  • Why use this when 507K is available?
  • Wider than the G43 slide width
  • Additional optic plate required

$60 off $600 (use code: MC4) – Complete the build you have been saving up for

Glock 43X MOS Red Dot Sights Compatibility [Plate Options]

RMSc red dot will fit the factory Glock 43X MOS red dot footprint. It also has the same Glock 48 MOS red dot compatibility.

These are recommended plate options:


OuterImpact (For non MOS model)


Glock 43X Red Dot Slide

Agency Arms Hybrid Special Glock 43/43X Stripped Precut Pistol Slide, Black, G43-H-SL

If you don't like the factory slide, you can check out some awesome custom Glock 43 optic ready slides here