Here are the 5 best Glock 43X MOS red dot sights that are compatible. We've narrowed them down based on compatibility, battery life, durability and price.

We purchased and shot all of them to find what works and what doesn't. Some require slight slide modification and some require a new slide to fit.

To save you the trouble, here are your options:

Best Glock 43X Red Dot Sights

Disclosure: All products have affiliate links for earning commission to support the website when you purchase 

Top 3 Options

Best Overall

Holosun 507K

Best Weatherproof

Holosun EPS Carry

Best Price

Shield RMSc

Holosun 507K X2 - Best Overall

holosun 507k on glock 43 mos

Rear index post removal required on the factory Glock 43X MOS slide to fit. Unless using the CHPWS adapter plate with recoil lugs

Holosun 507K is by far the best micro red dot sight for Glock 43X MOS (RMSc footprint). 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.

Fast Reticle Acquisition - Highly recommend using a suppressor height front sight co-witness to pick up the dot faster


  • Magnification: 1X
  • Reticle: 2 MOA dot, 32 MOA ring, or combined
  • Turret Value: 1 MOA / Click
  • Window Size: 0.58" X 0.77"
  • Construction: 7075 T6 aluminum IP67 rated
  • Dimension: 1.6" X 0.98" X 0.95"
  • Weight: 1 oz
  • Battery Life: 50,000 hours


  • Side battery access without sight removal
  • Very long battery life
  • Features Shake awake technology
  • Small for CCW
  • Durable front lens construction


  • MOA adjustment requires a small flat head screw driver
  • Motion sensor for the purpose of saving battery maybe be not so useful for CCW

Trijicon RMRcc - Best Durability

glock 43 mos pov

The Trijicon RMRcc has the same RMR durability and it's for the single stack Glock 43X MOS. In order to mount the RMRcc on the Glock 43X, there are two options:

Reduced 0.2" for slimmer profile - Fits flush on the Glock 43'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

Highly recommend using a suppressor height front sight to co-witness for faster dot acquisition.


  • Magnification: 1X
  • Window Size: 0.5" X 0.74"
  • Reticle: 3.25 or 6.5 MOA
  • Turret Value: 3 MOA / click
  • Construction: 7075 T6 forged aluminum
  • Dimension: 1.8" X 0.95" X 0.97"
  • Weight: 1 oz
  • Battery: 1 CR2032 battery
  • Battery Life: 2 - 3 years


  • As durable as the original Trijicon 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
  • Hard to pick up the dot without a tall front sight to co-witness

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Holosun EPS Carry - Best Weatherproof

glock 43X MOS holosun EPS carry

The Holosun EPS Carry features Holosun K pattern mounting footprint works with the RMSc plate that directly mounts on the factory Glock 43X MOS slide. The mounting plate fits both front and rear recoil lugs and the EPS Carry fits right on the top.

Closed Emitter - Fully weatherproof against dirt, water and other debris

Side Battery Access - Insert the battery from the side without sight removal

6 Reticle Systems - 2 MOA, 6 MOA and mutli reticle system with 32 MOA ring (with solar failsafe). Sold separately

No Lens Distortion - Refined glass window without edge distortion


  • Magnification: 1X
  • Reticle: 2 MOA, 6 MOA or MRS
  • Turret Value: 1 MOA / Click
  • Window Size: 0.58" X 0.77"
  • Construction: 7075 T6 aluminum IPX8 rated
  • Dimension: 1.62" X 1.07" X 0.95"
  • Weight: 1 oz
  • Battery Life: 50,000 hours


  • Very durable for carry
  • Full weatherproof
  • Prevents accidental button adjustment in lock out mode
  • Very long battery life
  • No lens distortion
  • No recoil lug trimming required


  • Turret tool required to adjust MOA

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.


  • Magnification: 1X
  • Reticle: 4 or 8 MOA
  • Turret Value: 1/4 inch at 20 yards
  • Construction: Aircraft aluminum 
  • Dimension: 1.7" X 0.9" X 0.9"
  • Weight: 0.57 oz
  • Battery Life: 2 - 3 years


  • 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. 


  • Magnification: 1X
  • Reticle: 3 MOA
  • Turret Value: 1 MOA / Click
  • Field of View: 1X16mm
  • Construction: 7075 T6 aluminum 
  • Dimension: 1.61" X 0.91" X 0.94"
  • Weight: 0.62 oz
  • Battery Life: 50,000 hours


  • Easy to mount 
  • Holds zero
  • Affordable


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

Glock 43X MOS Optic Accessories

These are recommended plate options:

CHPWS V4 Plate

OuterImpact (For non MOS model)


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