The Aimpoint PRO is renowned for its durability and reliability. It features a 2 MOA red dot, which is perfect for both precision shooting and quick target acquisition. The sight offers an impressive battery life of up to 30,000 hours, which means you can rely on it for years without needing to replace the battery. Its rugged design makes it water-resistant up to 150 feet, and it comes with a QRP2 mount, ensuring a secure fit on your Sig Sauer M400.

Pros

Exceptional battery life

Durable and reliable construction

Easy to mount and adjust

Clear and precise 2 MOA dot

Cons

Heavier than some competitors

Higher price point

Experience

Using the Aimpoint PRO on my Sig Sauer M400 has been a game-changer. The sight's clarity and precision are outstanding, and its durability means I can take it into any environment without worry. The battery life is phenomenal; I haven’t had to change it once in the year I've been using it.

Customer Comments

Many users praise the Aimpoint PRO for its reliability and battery life. One user mentioned, "I've had this sight on my rifle for over two years, and it's still going strong. The dot is always bright and clear, and it holds zero perfectly."

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2. Trijicon MRO (Miniature Rifle Optic)

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Specifications

Battery Life: 5 years on setting 3

Dot Size: 2 MOA

Water Resistance: Submersible up to 100 feet

Weight: 4.1 ounces

Mount: Multiple mounting options available

Best Features

The Trijicon MRO is known for its compact and lightweight design. It features a 2 MOA dot and offers an impressive battery life of up to 5 years. The sight is submersible up to 100 feet, making it a great choice for various shooting conditions. Its multi-coated lenses provide a crisp and clear sight picture, and the large viewing area allows for rapid target acquisition.

Pros

Compact and lightweight

Long battery life

Crisp and clear optics

Large field of view

Cons

Slightly higher price

Some users report difficulty with the adjustment dials

Experience

The Trijicon MRO has been a pleasure to use on my M400. Its lightweight design doesn't add much bulk to the rifle, and the large field of view makes it easy to acquire targets quickly. The battery life is excellent, and the sight picture is consistently clear and bright.

Customer Comments

Users generally love the Trijicon MRO for its compact size and clarity. One reviewer noted, "The MRO is perfect for my AR-15. It's lightweight, and the dot is always easy to see, even in bright sunlight."

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3. EOTech EXPS3

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Specifications

Battery Life: 1,000 continuous hours at setting 12

Dot Size: 1 MOA dot with 68 MOA ring

Water Resistance: Submersible up to 33 feet

Weight: 11.2 ounces

Mount: Quick-detach lever

Best Features

The EOTech EXPS3 is famed for its holographic technology, which provides an incredibly fast target acquisition. The 1 MOA dot with a 68 MOA ring offers versatility for various shooting scenarios. The quick-detach lever allows for easy attachment and removal, and the sight is built to withstand tough conditions, being water-resistant up to 33 feet.

Pros

Quick target acquisition

Versatile reticle options

Easy to mount and detach

Durable construction

Cons

Shorter battery life compared to competitors

Heavier and bulkier

Experience

Using the EOTech EXPS3 on the Sig Sauer M400 has been an exhilarating experience. The holographic sight offers one of the quickest target acquisitions I've ever experienced, and the reticle is versatile for different shooting scenarios. However, I did find myself changing batteries more often than with other sights.

Customer Comments

Users often highlight the EXPS3's speed and accuracy. One comment read, "This sight is fantastic for fast-paced shooting. The holographic reticle is clear and easy to pick up, making it great for both close and mid-range engagements."

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4. Holosun HS510C

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Specifications

Battery Life: 50,000 hours

Dot Size: 2 MOA dot with 65 MOA circle

Water Resistance: IP67 rated

Weight: 8.3 ounces

Mount: Integrated quick-detach mount

Best Features

The Holosun HS510C stands out with its solar panel and battery backup, ensuring a long operational life of up to 50,000 hours. It features a 2 MOA dot with a 65 MOA circle, providing a versatile reticle system. The sight is IP67 rated for water and dust resistance and includes an integrated quick-detach mount for easy installation and removal.

Pros

Long battery life with solar backup

Versatile reticle system

Durable and water-resistant

Affordable price point

Cons

Larger profile

Slightly heavier than some competitors

Experience

The Holosun HS510C has been a reliable addition to my Sig Sauer M400. The solar panel feature is a great touch, ensuring the sight remains operational even if the battery dies. The reticle options are versatile, and the sight holds up well in various weather conditions.

Customer Comments

Many users appreciate the value the HS510C offers. One user commented, "This sight offers incredible features for the price. The solar panel is a game-changer, and the reticle is perfect for both quick target acquisition and precision shooting."

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5. Vortex Optics Sparc AR

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Specifications

Battery Life: 50,000 hours on lowest setting

Dot Size: 2 MOA

Water Resistance: Waterproof and fog proof

Weight: 7.5 ounces

Mount: Multi-height mount system

Best Features

The Vortex Optics Sparc AR is known for its affordability without compromising on quality. It features a 2 MOA dot and offers a battery life of up to 50,000 hours on the lowest setting. The sight is waterproof and fog proof, ensuring reliable performance in various conditions. Its multi-height mount system allows for customizable mounting options.

Pros

Affordable price

Long battery life

Waterproof and fog proof

Customizable mount

Cons

Battery compartment can be tricky to access

Dot brightness can be inconsistent in very bright light

Experience

I've found the Vortex Sparc AR to be a fantastic budget-friendly option for my Sig Sauer M400. It offers all the essential features you'd expect from a red dot sight, with a long battery life and reliable performance in various conditions. However, the battery compartment can be a bit challenging to access when it needs changing.

Customer Comments

Users often highlight the Sparc AR's value for money. One review mentioned, "For the price, you can't beat the Sparc AR. It has all the features I need and performs just as well as some of the higher-priced sights."

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6. Sig Sauer Romeo5

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Specifications

Battery Life: 40,000 hours

Dot Size: 2 MOA

Water Resistance: IPX-7 rated

Weight: 5.1 ounces

Mount: M1913 Picatinny low mount riser

Best Features

The Sig Sauer Romeo5 is designed specifically for rifles like the M400. It features a 2 MOA dot and offers an impressive battery life of up to 40,000 hours. The sight is IPX-7 rated for waterproof performance and comes with a Picatinny low mount riser. Its MOTAC (Motion Activated Illumination) feature powers up the sight when it senses motion and powers down when it doesn’t, conserving battery life.

Pros

Motion-activated illumination

Long battery life

Waterproof

Affordable

Cons

Some users find the dot too bright at lower settings

Mounting system could be more robust

Experience

The Sig Sauer Romeo5 has been a perfect match for my M400. The MOTAC feature is incredibly convenient, ensuring the sight is always ready when I am. Its battery life and waterproof rating make it a reliable choice for all my shooting needs.

Customer Comments

Users appreciate the Romeo5’s combination of features and affordability. One reviewer said, "The Romeo5 is the best bang for your buck. The motion activation is fantastic, and it’s held zero perfectly through hundreds of rounds."

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How to Choose the Best Red Dot Sight for Your Sig Sauer M400?

When selecting the best red dot sight for your Sig Sauer M400, consider the following factors:

Battery Life: A long battery life is crucial for uninterrupted performance. Look for sights that offer at least several thousand hours of battery life.

Durability: Your sight should be able to withstand harsh conditions. Water resistance, fog proofing, and robust construction are essential.

Weight: Lighter sights are generally preferred as they do not add significant bulk to your rifle, making it easier to handle.

Reticle Options: Some sights offer multiple reticle options. Choose one that suits your shooting style and needs.

Ease of Use: Look for features like quick-detach mounts, easy-to-access battery compartments, and simple adjustment dials.

Top 6 Best Red Dot For Sig Sauer M400 in 2024

1. Aimpoint PRO (Patrol Rifle Optic)

2. Trijicon MRO (Miniature Rifle Optic)

3. EOTech EXPS3

4. Holosun HS510C

5. Vortex Optics Sparc AR

6. Sig Sauer Romeo5

How to Choose the Best Red Dot Sight for Your Sig Sauer M400?

FAQs

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