When it comes to enhancing the accuracy and performance of an M4, a reliable laser sight is an essential accessory. With a variety of options available, it can be challenging to choose the best one for your needs.

In this comprehensive guide, I will review some of the top laser sights suitable for the M4, focusing on their specifications, best features, pros and cons, user experiences, and why they are a perfect fit for this iconic firearm. We'll also explore the laser light combos, provide a guide on choosing the best laser, and answer some frequently asked questions.

Top 6 Best Laser Sights for M4 on the Market

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SureFire X400U-A⁠

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Streamlight TLR-8A Flex⁠

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Crimson Trace CMR-204⁠

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OLIGHT Baldr Pro R⁠

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Viridian X5L Gen 3⁠

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HOLOSUN LS321G⁠

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Note: The following advice comes from my personal perspective. What works for me might not work for you, but hopefully it sparks some ideas!

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SureFire X400U-A - Laser Light Combo

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Specifications

Laser Type: Green

Output: 500 Lumens (light), 5 mW (laser)

Runtime: 1.5 hours

Mounting: Picatinny / Universal Rail

Weight: 4.9 ounces

Best Features

The SureFire X400U-A combines a high-intensity white light with a precision green laser, making it a versatile choice for tactical scenarios. The laser is visible in both daylight and low-light conditions, providing excellent aiming capability.

Pros

High-intensity light and laser combo

Durable construction

Easy to mount and adjust

Cons

Higher price point

Shorter battery life compared to some competitors

User Experience

Many users praise the SureFire X400U-A for its robust performance and reliability. It's particularly favored by law enforcement and military personnel for its durability and effectiveness in various conditions.

Why It Fits the M4

The M4, known for its versatility and reliability, pairs exceptionally well with the SureFire X400U-A. The combination of a powerful light and a precise laser enhances the tactical capabilities of the M4, making it suitable for both close-quarters combat and long-range engagements.

Online Customer Comments

"The SureFire X400U-A is worth every penny. The laser is bright and the light is incredibly powerful."

"I’ve used this in multiple training scenarios, and it has never failed me."

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Streamlight TLR-8A Flex - Laser Light Combo

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Specifications

Laser Type: Red

Output: 500 Lumens (light), 640-660 nm (laser)

Runtime: 1.5 hours

Mounting: Rail clamp system

Weight: 2.64 ounces

Best Features

The Streamlight TLR-8A Flex is known for its compact design and ease of use. The ambidextrous switch makes it convenient for both right and left-handed shooters, and the low-profile design minimizes snag hazards.

Pros

Compact and lightweight

Easy to install and use

Ambidextrous controls

Cons

Red laser might be less visible in daylight

Slightly lower runtime

User Experience

Users appreciate the TLR-8A Flex for its simplicity and reliability. The compact size does not add significant weight to the firearm, making it a popular choice for everyday carry and home defense.

Why It Fits the M4

The lightweight and compact nature of the TLR-8A Flex complements the M4's design, ensuring that the firearm remains maneuverable and easy to handle. Its quick-attach system allows for rapid deployment, a crucial feature for tactical operations.

Online Customer Comments

"Perfect for my M4. Lightweight, and the controls are very intuitive."

"The red laser is clear and easy to see, even in low-light conditions."

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Crimson Trace CMR-204 - Laser Light Combo

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Specifications

Laser Type: Green

Output: 100 Lumens (light), 5 mW (laser)

Runtime: 2 hours

Mounting: M1913 Picatinny rail

Weight: 2.72 ounces

Best Features

The Crimson Trace CMR-204 features a bright green laser and a 100-lumen LED light. The Instant Activation switch allows the user to activate the laser and light with a natural grip, making it highly intuitive.

Pros

Bright green laser

Instant Activation switch

Lightweight and durable

Cons

Lower light output

Slightly higher cost

User Experience

Users often highlight the CMR-204's Instant Activation feature, which enhances the speed and ease of use during high-stress situations. The green laser is also praised for its visibility in various lighting conditions.

Why It Fits the M4

The Crimson Trace CMR-204 is an excellent addition to the M4, providing a reliable aiming solution without adding significant weight. Its intuitive activation mechanism ensures that the operator can quickly engage the laser and light when needed.

Online Customer Comments

"The Instant Activation is a game-changer. Quick and easy to use."

"The green laser is very bright and visible, even during the day."

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OLIGHT Baldr Pro R - Laser Light Combo

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Specifications

Laser Type: Green

Output: 1350 Lumens (light), 5 mW (laser)

Runtime: 1.5 hours (light + laser)

Mounting: Picatinny / Glock rail

Weight: 4.55 ounces

Best Features

The OLIGHT Baldr Pro R stands out with its impressive 1350-lumen light and powerful green laser. It features a quick-detach mount and a magnetic USB charging system, making it convenient and easy to use.

Pros

High light output

Rechargeable battery

Quick-detach mount

Cons

Bulkier design

Slightly more expensive

User Experience

Users are particularly impressed with the Baldr Pro R's light output and rechargeable battery. The magnetic charging system is a highlight, providing ease of use and eliminating the need for disposable batteries.

Why It Fits the M4

The high-output light and powerful laser of the OLIGHT Baldr Pro R make it a formidable accessory for the M4. Its quick-detach system allows for easy mounting and removal, adapting to various operational needs.

Online Customer Comments

"The light is incredibly bright, and the green laser is spot-on."

"Love the magnetic charging. No more fumbling with batteries."

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Viridian X5L Gen 3 - Laser Light Combo

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Specifications

Laser Type: Green

Output: 500 Lumens (light), 5 mW (laser)

Runtime: 6 hours (laser only), 1.5 hours (light + laser)

Mounting: Universal rail mount

Weight: 3.3 ounces

Best Features

The Viridian X5L Gen 3 is known for its extended battery life and enhanced visibility. It features a powerful green laser and a 500-lumen tactical light, with a unique instant-on technology that activates the laser and light upon drawing the firearm.

Pros

Long battery life

Instant-on technology

Lightweight

Cons

Moderate light output

Higher price

User Experience

Users appreciate the X5L Gen 3's instant-on feature, which is particularly useful for self-defense situations. The green laser's visibility and the light's moderate output make it a reliable tool for various applications.

Why It Fits the M4

The Viridian X5L Gen 3's instant-on technology enhances the M4's readiness, making it ideal for quick-response scenarios. Its lightweight design ensures that the M4 remains easy to handle and maneuver.

Online Customer Comments

"The instant-on feature is fantastic. Quick and reliable."

"Great battery life and very bright laser."

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HOLOSUN LS321G

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Specifications

Laser Type: Green, IR

Output: 500 Lumens (light), 1 mW (IR laser), 5 mW (green laser)

Runtime: Up to 5 hours

Mounting: Picatinny rail

Weight: 8.1 ounces

Best Features

The HOLOSUN LS321G is a multi-laser system featuring both green and IR lasers, making it versatile for day and night operations. It is built with a robust aluminum housing, ensuring durability in harsh conditions.

Pros

Multi-laser system

Durable construction

Long battery life