aimpoint m4 vs m4s

Aimpoint Comp M4 vs M4s Comparison Review

Aimpoint AB is a Sweden-based optics company that was founded 40+ years ago in 1974.  Its Comp series sights including the ones in this aimpoint comp m4 vs m4s comparison review are among the world’s most popular.

You might be wondering which product is a better option for your hunting or target-shooting. The company states the main difference between the M4 and M4S is the battery location. In fact, this might affect some gun owners since the M4’s battery compartment is on top. We’ll take a closer look at the two items including their features, pros, and cons. That will help you pick the best one for your needs.

Aimpoint Comp M4 vs M4S Comparison Review


M4 M4S
Weight 1 lb. 1.1 lbs.
Length 4.7 ft. 4.5 ft.
Magnification 1x 1x
Brightness Settings 9 9
Submersible 150 ft. 150 ft.
Batteries 1 AA 1 AA
Battery Location Top Low

    aimpoint-comp m4 vs m4s   


The Aimpoint CompM4 is a red dot-style gun sight that’s non-magnified. This item is produced by Aimpoint AB and is the successor of the Comp M2. The Comp M4 is used by the US Armed Forces.

This is a “tubed” style reflex sight that uses a LED at the focus of a mirror-like optical collimator. This produces a lined-up red aiming spot known as a red dot sight.

Meanwhile, the M4S is a variant of the M4. It contains the same basic features/functionality. However, the battery compartment and power control knob are mounted close to the sight’s bottom rather than the top.

Benefits/Drawbacks of M4 & M4S

AimPoint M4

ProsAimpoint m4

  • Durable design
  • Well-established manufacturer
  • Accurate at various ranges
  • Long battery life
  • Intuitive/easy to use



  • Heavier than other red dot sights
  • Battery compartment location
  • High price point

AimPoint M4S

ProsComp M4s

  • Long battery life
  • 2/10- year limited warranty
  • Includes lens cover
  • Built-in mount
  • Better energy efficiency



  • High cost
  • 2-yr. warranty for competitive/professional use
  • Similarities of XPS2 & 512

Key Features

  • Super-long-lasting battery
  • Built-in voltage regulator
  • Mount base screws into sight
  • 2 MOA dot sizes
  • Accurate at different ranges
  • Works with all NVDs
  • Lightweight sights
  • High quality/durability

2 MOA Dot Sizes

These dual minute of angle (MOA) dot sizes that you can use for close/long-distance shooting. This feature makes them ideal for use with the company’s 3XMangificer as well as the Concealed Engagement Unit (CEU).

Anti-reflective Coating

These sights include the company’s in-house lens coating that includes multiple layers. It provides a clear vision regardless of the lighting conditions you’re in when using your firearm/sight.

Popular Product

In fact, the M4 alone has 1+ million users. This makes it easy to deal with any questions or problems you have via forum posts and product guides. There’s a 99.9% chance you can find answers to your questions through these sources.

Mount Base

The mount bases of the two units are keyed into the sight’s body in order to reduce recoil. In addition, you can screw the mount base into the sight directly. This is a plus since you won’t have to buy or secure a separate sight ring.

Long-lasting Durability

The Aimpoint Comp M4/M4s are some of the most durable red dot sights on the market today. This is due to the units being designed for military use. However, Aimpoint later decided to begin selling these products to the public due to the increasingly popularly of its Comp products.

Lighting Settings

The units have a total of 16 lighting settings. That includes 9 for daylight brightness and 7 for night vision. This feature adds value to the units and makes them a good option for all lighting conditions.

Moderate Weight

The weight of these sights isn’t particularly lightweight. However, it’s worth noting that mounting screws are used rather mounting rings, so the weight is moderately higher. You should also consider the durable construction adds to the sights’ weight, so it’s a factor to consider.

Accessory Compatibility

These sights work very well with other attachments. For example, if you add a magnifier, it will make the sight outstanding for long-distance shooting. If you’re considering magnifying modules, you should consider the Aimpoint Mag3X for best compatibility.

Long-lasting Battery

The company’s in-house super ACET Diode Circuitry lets the sight run continuously for a maximum of 80,000 hrs. or 8 yrs. on one AA battery.

Another key feature is the built-in voltage regulator. This allows the units to work with any AA battery manufactured anywhere in the world. This prevents the need to special-order batteries for the sight.

ORP2 Mount

This mount has 2x more clamping force vs. the original ORP. In addition, the mounting knob is also wider/shorter. This boosts operation and reduces the likelihood of getting damaged when contacting other gear.

Night Use

The M4 and M$S both include 7 nighttime settings. The units also work with all generations of Night Vision Devices (NVDs).

Differences between M4 & M4S

The primary difference between the M4 and M4S is the location of the battery compartment. It’s on top in the case of the M4 while the M4S has a low-mounted compartment. Some owners find the M4’s mounting position to be intrusive although there’s an ongoing debate about whether it affects one’s field of view (FOV).

Another plus the location of the M$S’ battery is it also offers more protection for the battery compartment and switch. So, in terms of convenience and durability, these are both important factors to consider when weighing the M4 and M4S.


If you’re looking for a high-quality red dot sight in the under-$1000 category, then the M4 and M4S are both excellent options. In this aimpoint comp m4 vs m4s comparison review, we’ve covered some of the main features, benefits, and drawbacks of each unit.

The main plus of the Aimpoint Comp M4S is the low-profile battery compartment. This offers better FOV and protection if you were to drop your weapon. If these features are critical for you, then the M4S is a wiser choice. Meanwhile, if that’s not the case, then the M4 is a better option.

If you want to don’t require all the specs and features of the M4/M4S then you should consider the Aimpoint PRO as a Plan B. It offers many of the same bells and whistles yet is about half the price.

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