6 Best Red Dot Sight For Sig M18

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Hitting the mark: with Best Red Dot Sight For Sig M18 in 2023.

I’ve dedicated countless hours in research, test-firing, and understanding the nuances of each sight on a Sig M18. One model stands out from the crowd, the Trijicon RMR Type 2

This isn’t merely an opinion, it’s a conclusion borne of extensive, hands-on testing. This sight has consistently proven to be an unparalleled companion to the Sig M18, aligning brilliantly with the firearm’s performance characteristics. It’s a sight that transforms the Sig M18 experience.

The purpose of this article is to provide an in-depth review and analysis of the best red dots for Sig M18.

The article will explore 6 Red Dot options, evaluate their pros and cons, and ultimately guide the readers in making an informed decision about the most suitable red dot for Sig M18.

FYI, prices accurate at the time of writing.

Best Red Dot For Sig m18CategoryPrice
Trijicon RMRBest Overall$499
Leupold DeltaPoint ProHighly Durable$349.99
HOLOSUN HE507C-GR X2 Best Budget Trijicon Alternative$299.99
EOTECH EFLX Mini Ultra Compact$369
HOLOSUN HE508T-RD X2Best Multiple Reticle$369
Sig Sauer Romeo 1 ProBest Lens Clarity$349.44

Top 6 Best Sig M18 Red Dot optics

1. Trijicon RMR Type 2 – High End Performance

Trijicon RM06-C-700672 RMR Type 2 Adjustable LED Sight, 3.25 MOA Red Dot Reticle, Black
  • 3.25 MOA ADJUSTABLE LED RMR: Features an automatic...
  • UNIQUE PATENTED HOUSING SHAPE: Military-grade aluminum...
  • BATTERY CONSERVATION MODE: Automatically adjusts aiming...
  • BUTTON LOCKOUT: Sets RMR into automatic mode to prevent...

The Trijicon RMR Type 2 is a rugged, miniature reflex sight that excels in durability, versatility, and reliable performance.

Adjustable LED Sight: The adjustable LED allows you to control the brightness settings effortlessly, ensuring optimal visibility in any light condition.

Dual-Illuminated Option: This feature offers you an edge in low-light scenarios, as it illuminates the reticle and adjusts automatically to the changing light conditions.

Multiple MOA Dot Options: The sight provides three MOA dot options (1.0, 3.25, and 6.5). Each caters to a different shooting preference, whether it’s long-range accuracy, a balance of accuracy and visibility, or enhanced visibility for close-quarter scenarios.

Redesign for Durability: Trijicon’s redesign of the RMR Type 2 has bolstered its durability even further. With a tighter battery compartment, it promises more reliable performance under extreme conditions.

Slide Racking: The robust lens design of the RMR Type 2 allows you to rack the slide on hard objects without damaging it, underlining its build quality.

Why I love it: Trijicon RMR Type 2 impresses me with its remarkable robustness and versatility. The multiple MOA dot sizes are a game-changer, allowing me to adapt my shooting style based on the situation or my preferences at any given moment.

Compatibility: While the Sig M18 is cut for the Delta Point Pro footprint, fitting the RMR Type 2 onto the M18 is straightforward using an adapter plate. It may not be a direct fit, but it is certainly a manageable process.

My Experience

In my hands-on experience with the RMR Type 2, I found its reputation for durability and reliability well-earned. The 3.25 MOA dot was my personal favorite—it’s the ideal balance between easy eye acquisition and accuracy. The adjustable LED sight and dual-illuminated options further elevated my shooting experience, especially in varying light conditions.


  • Exceptional durability and ruggedness
  • Adjustable LED sight offers great visibility
  • Multiple MOA dot options cater to various shooting needs
  • Excellent battery life
  • Can be mounted on Sig M18 using an adapter plate


  • Not a direct fit for Sig M18—requires an adapter plate
  • Battery needs to be accessed from the bottom, requiring re-zeroing after a change

2. Leupold DeltaPoint Pro – High Durability

Leupold DeltaPoint Pro Red Dot Sight, 2.5 MOA Dot - Dark Earth finish
  • Model #175840 - DeltaPoint Pro Red Dot Sight, 2.5 MOA...
  • Leupold’s Professional-Grade Red Dot Optical System...
  • This scopes comes with an illuminated reticle, which...
  • Motion Sensor Technology (MST) extends battery life by...
  • Design, Machined and Assembled in the USA. 100%...

The Leupold DeltaPoint Pro is a highly durable and versatile red dot sight, known for its reliability, battery efficiency, and high-quality optical system.

Pro-Grade Red Dot Optical System: The high-grade optical system provides excellent light transmission, glare reduction, and superior clarity even under challenging lighting conditions.

Illuminated Reticle: The illuminated reticle enhances target acquisition speed in low-light situations, providing a significant edge to shooters.

Motion Sensor Technology: MST helps in prolonging battery life by deactivating the reticle after 5 minutes of inactivity and reactivating upon movement.

Waterproof, Fogproof, & Shockproof: The sight is built to withstand extreme weather conditions and shocks, ensuring its performance remains unaffected in varied situations.

Top-Loading Battery Access: The DeltaPoint Pro features a top-loading battery compartment, allowing for straightforward battery changes without needing to remove the sight from your firearm.

Why I love it: The Leupold DeltaPoint Pro seamlessly integrates reliability, durability, and technological innovation. The motion sensor technology, illuminated reticle, and top-loading battery compartment, in particular, make it a joy to use.

Compatibility: The DeltaPoint Pro aligns perfectly with the Sig M18. Given that the M18 is designed for the DeltaPoint Pro footprint, mounting it on your gun is a breeze.

My Experience

My time with the DeltaPoint Pro on the Sig M18 was nothing short of impressive. The 2.5 MOA dot reticle hit the sweet spot for accuracy and quick target acquisition. I also appreciated the large sight window, which provided a broad field of view. The motion sensor technology was a boon, maximizing battery efficiency.

Leupold Deltapoint Pro vs Trijicon RMR


  • Excellent durability and reliability
  • High-grade optical system ensures excellent visibility
  • Motion Sensor Technology maximizes battery life
  • Top-loading battery compartment simplifies battery changes
  • Perfectly compatible with the Sig M18


  • Only two MOA options available, limiting flexibility compared to some competitors

3. HOLOSUN HS507C X2 – Best Budget Alternative of Trijicon

HOLOSUN HS507C-X2 Classic Multi Reticle Red Dot Sight, Black
  • INCLUDES: Holosun HS507C-X2 Red Dot Sight | Coin...
  • LONG BATTERY LIFE: Features include Holosun’s Super...
  • ADVANCED TECHNOLOGY: There are 12 different brightness...
  • SHAKE AWAKE: Holosun’s Shake Awake Technology shuts...
  • Holosun optics with Solar Failsafe feature automatic...

The HOLOSUN HS507C X2 is a highly reliable, feature-packed red dot sight that provides excellent durability and performance at a competitive price point.

Multiple Reticle System: The HS507C X2 comes with a multiple reticle system, offering a choice between a 2 MOA and a 32 MOA dot ring for versatile shooting scenarios.

Solar Failsafe: The sight features a solar failsafe that provides backup power, ensuring the sight remains operational even when the battery dies.

Shake Awake Technology: The sight employs shake awake technology that puts the device to sleep when not in use, conserving battery life and activating on movement detection.

Aluminum Housing: The sight is housed in 7075 aluminum, providing extreme strength and shock resistance, enhancing the overall durability of the sight.

Multi-Coated Glass Lens: The HS507C X2 is fitted with a multi-coated glass lens that offers maximum light wave transmission and resistance to wear and shock.

Why I love it: What I find particularly impressive about the HOLOSUN HS507C X2 is its combination of features. The long battery life and the multiple reticle system give you a powerful, versatile optic at a great price point.

Compatibility: Although the HS507C X2 features an RMR footprint and requires an adapter plate for mounting on the Sig M18, the process is straightforward and results in a solid, sturdy setup.

My Experience

My experience with the HS507C X2 was thoroughly enjoyable. The multiple reticle system was a game-changer, providing flexibility in various shooting scenarios. The shake awake feature and solar failsafe provided a sense of reliability, knowing the sight wouldn’t let me down.


  • Versatile multiple reticle system
  • Solar failsafe provides power backup
  • Shake awake technology saves battery life
  • Robust aluminum housing adds to durability
  • Multi-coated lens provides excellent visibility


  • Requires an adapter plate for mounting on Sig M18
  • Has a slight bluish tint that may affect visibility in certain conditions

4. EOTECH EFLX – Ultra Compact

EOTECH Mini Reflex Holographic Weapon Sight, 3 MOA Dot
  • EOTECH EFLX3RWBLK - Mini Reflex Sight in black with 3...
  • BUILT TOUGH - Rugged aluminum housing provides...
  • CRYSTAL CLEAR - High-tech front glass is clear and...
  • QUICK ACQUISITION - The large, rectangular window...
  • USER FRIENDLY - A top loading battery makes for simple...

The EOTECH EFLX is an ultra-compact, highly robust reflex sight with a large viewing window and impressive battery life, designed for precise and rapid target acquisition.

Aluminum Housing: The EFLX features a rugged aluminum housing that significantly enhances its durability and resistance to tough conditions.

Large Sight Window: A large, square viewing window provides a wide field of view and ensures quick target acquisition.

20,000 Hour Battery Life: With around 20,000 hours of battery life from a single CR2032 battery, the EFLX ensures reliable long-term performance.

Top Access Battery Compartment: The top-loading battery compartment allows for easy battery replacements without the need to remove the optic from your firearm.

8 Brightness Settings: With 8 brightness settings, the EFLX provides optimum visibility under varying light conditions.

Why I love it: The EOTECH EFLX excels in its simplicity and durability. The large sight window, coupled with the robust aluminum housing and long battery life, makes it a reliable tool for all shooting conditions.

Compatibility: The EFLX features a Delta Point Pro footprint, which is compatible with the Sig M18, making it easy to mount directly on the firearm without the need for additional adapters.

My Experience

In my use, the EFLX performed exceptionally. The wide field of view and quick target acquisition significantly improved my shooting experience. The top-loading battery design also proved to be highly convenient.


  • Sturdy aluminum housing for enhanced durability
  • Wide field of view for rapid target acquisition
  • 20,000-hour battery life ensures long-term reliability
  • Top access battery compartment for easy battery changes
  • 8 brightness settings adapt to various light conditions


  • Dot reticle may be less precise for longer distances
  • A square viewing window might take getting used to for some shooters

5. HOLOSUN HE508T-RD X2 – Multiple Reticle

HOLOSUN HE508T-RD X2 Multi-Reticle Red 2 MOA Dot & 32 MOA Circle Open Reflex Pistol Sight - Solar Failsafe Shake-Awake Durable Titanium Handgun Sight with Multilayer Reflective Glass
  • HOLOSUN RED DOT SIGHT - The HE508T-RD X2 is a hard-use...
  • MULTI-RETICLE SYSTEM - This Holosun sight is equipped...
  • SHAKE AWAKE TECHNOLOGY - Extends battery life by...
  • SOLAR FAILSAFE - If your battery fails, this red dot...
  • SPECIFICATION - Reticle: Red 2 MOA Dot & 32 MOA Circle;...

The HOLOSUN HE508T-RD X2 is a versatile, highly durable red dot sight that offers multiple reticle options, excellent power management, and robust titanium construction.

Titanium Housing: The sight comes with a durable, CNC-machined titanium housing that ensures it can withstand heavy usage and adverse conditions.

Solar Failsafe Technology: The Solar Failsafe technology allows the sight to remain functional even if the battery runs out, thanks to its integrated solar panel, ensuring continuous performance.

Shake Awake Technology: The Shake Awake technology enables the sight to conserve battery by going dormant when not in use and activating once movement is detected.

Multiple Reticle System: The sight provides a flexible shooting experience with its Multiple Reticle System, allowing you to choose from a 2 MOA dot, a 32 MOA circle, or a combination of the two.

12 Brightness Settings: With 12 brightness settings, including two that are night-vision compatible, the sight allows for adjustments to any light condition.

Why I love it: The HOLOSUN HE508T-RD X2 stands out for its versatility, robustness, and intelligent power management. The multiple reticle system and the ability to adjust brightness levels ensure optimal performance in diverse shooting scenarios.

Compatibility: While the sight comes with a Trijicon RMR footprint, you will need an adapter plate to mount it on the Sig M18. Once mounted, the combination of the sight and gun delivers an impressive shooting experience.

My Experience

Using the HE508T-RD X2 was a pleasure, with its numerous features enhancing my shooting. The Multiple Reticle System offered flexibility in shooting, while the Solar Failsafe and Shake Awake technologies ensured uninterrupted functionality.


  • Durable titanium housing ensures long-term reliability.
  • Solar Failsafe and Shake Awake technologies enhance battery performance.
  • Multiple Reticle System offers flexibility in targeting.
  • 12 brightness settings adapt to a variety of light conditions.
  • Side-mounted battery tray simplifies battery replacement.


  • Needs an adapter plate for mounting on Sig M18.
  • High-end pricing may not be suitable for budget-conscious users.

Which is the Better and Why? Holosun 507c vs 508t

6. Sig Sauer Romeo 1 Pro – Best Lens

Sig Sauer SOR1P100 Romeo1Pro, 3 Moa 1.0 Moa Adjust, Steel Shroud, Black
  • Molded glass aspheric lens with high-performance...
  • TruHold Lockless Zeroing System that utilizes twin...
  • MOA red dot with multiple brightness settings for rapid...
  • Point-source emitter provides exceptional brightness...
  • Motac (Motion Activated Illumination System)...

The Sig Sauer Romeo 1 Pro is a robust, high-performing red dot sight, designed with advanced features for swift engagements and extended battery life.

Molded Glass Aspheric Lens: The sight comes with a molded glass aspheric lens that offers excellent light transmittance and zero distortion, ensuring clear and accurate target acquisition.

3 or 6 MOA Red Dot: You have the option of a 3 MOA or 6 MOA red dot, both offering various brightness settings for rapid engagements regardless of lighting conditions.

TruHold Lockless Zeroing System: The TruHold Lockless Zeroing System can absorb recoil from the handgun and return to zero, ensuring consistent accuracy.

Motion Activated Illumination System: The MOTAC system activates the sight with motion and powers down when still, providing substantial battery power saving.

Protective Shroud: The sight comes with a rugged protective shroud, enhancing the sight’s overall durability.

Why I love it: The Sig Sauer Romeo 1 Pro impresses with its blend of durability, performance, and intelligent features. The molded glass aspheric lens and MOTAC system ensure an exceptional shooting experience.

Compatibility: The Sig Sauer Romeo 1 Pro is designed to pair perfectly with Sig Sauer firearms like the M18, providing seamless integration and optimal performance.

My Experience

The Sig Sauer Romeo 1 Pro provided an exceptional shooting experience with its advanced features, particularly the MOTAC system and the TruHold Lockless Zeroing System. The sight also performed well under various light conditions, thanks to its 12 brightness settings.


  • Durable construction with a protective shroud.
  • Molded glass aspheric lens ensures clarity and zero distortion.
  • The TruHold Lockless Zeroing System ensures accuracy.
  • MOTAC system conserves battery power.
  • Excellent light transmittance for fast target acquisition.


  • Not as durable as some other high-end models like the Delta Point Pro or Trijicon RMR.

Final Verdict

My extensive hands-on testing of various red dot sights on the Sig M18 led me to a decisive conclusion. Amongst the different options I examined, the Trijicon RMR Type 2 emerged as the standout choice. 

However, let’s not dismiss the other contenders. Each sight offers its own unique strengths, and what works best for one individual may not be the optimal choice for another. This analysis was not about identifying the ‘best’ sight in absolute terms, but about recognizing the diverse preferences and needs of shooters. 

While Trijicon RMR Type 2 is my top choice, your decision should hinge on which of these qualities resonate most strongly with your personal requirements and shooting style.


What red dot will fit the Sig P320 M18?

The Leupold DeltaPoint Pro can fit directly on the Sig P320 M18. The others, like Trijicon RMR Type 2 or Holosun models, require an adapter plate.

Is the SIG M18 optics ready?

Yes, the SIG M18 is optics ready. It comes with a removable rear sight plate that allows you to mount a red dot sight.

What is Sig’s best red dot?

Based on the tested products, the Sig Sauer Romeo 1 Pro is the best red dot sight from Sig due to its advanced features and seamless integration with Sig Sauer firearms like the M18.

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I'm Micheal, an avid shooter and hunting enthusiast from Texas. I'm a recreational shooter who loves to spend time at the range and enjoy learning about new firearms and gears. I love to write about guns and share my passion for shooting with others.

2 thoughts on “6 Best Red Dot Sight For Sig M18”

    • The Aimpoint ACRO P2 is indeed a top-notch sight, but I didn’t include it in this round of testing due to its larger size and unique design, which might not be everyone’s cup of tea. I wanted to focus on a variety of more compact options this time around. However, it’s definitely on my radar for future reviews.


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