Sig Sauer M400 Tread AR-15 Pistol Review

Sig Sauer M400 Tread AR-15 Pistol Review

Sig Sauer M400 Tread 556 Nato AR-15 Pistol PM400-11B-TRD

Today we’ll be doing a Sig Sauer M400 Tread AR-15 Pistol Review. This firearm is a compact, versatile, and lightweight option for shooters who want the power and accuracy of an AR-15 in a smaller package. In this review, we’ll examine the features that make the Sig Sauer M400 Tread stand out from the competition and discuss its strengths and weaknesses. Whether you’re considering adding this pistol to your collection or simply interested in learning more about it, this review will provide you with all the information you need. So, let’s dive in and explore the capabilities of this impressive AR-15 pistol.

About Sig Sauer

Sig Sauer is a leading firearms manufacturer based in the United States. The company was founded in Germany in 1853 as a wagon factory and began producing firearms in the early 1900s. Sig Sauer is known for producing high-quality firearms for military, law enforcement, and civilian use.

Thier product line includes pistols, rifles, and machine guns; the company is particularly well-known for its handguns. Sig Sauer’s most popular pistol models include the P226, P229, P320, and P365. These firearms are known for their reliability, accuracy, and ease of use and are used by law enforcement agencies and military organizations worldwide.

In addition to its firearms, Sig Sauer also produces a wide range of accessories and ammunition, including holsters, magazines, and scopes. The company is renowned for quality and innovation and is a popular choice among firearms enthusiasts and professionals.

History of the Sig Sauer M400 Tread AR-15 Pistol

The Sig Sauer M400 Tread AR-15 Pistol was first introduced in 2018 as part of the company’s new Tread series. The Tread series was designed to provide a modular, customizable platform for shooters of all skill levels, focusing on affordability and versatility.

The M400 Tread AR-15 Pistol is based on the popular AR-15 platform, which has a long and storied history in the firearms industry. The AR-15 was originally developed in the 1950s by Armalite, a division of the Fairchild Aircraft Corporation, as a lightweight and versatile rifle for military and law enforcement use. The design was later sold to Colt, which brought it to market as the M16 rifle.

Since its introduction, the AR-15 platform has become one of the most popular firearms in the United States, with millions of rifles and pistols sold to civilians, law enforcement agencies, and military organizations worldwide.

The Sig Sauer M400 Tread AR-15 Pistol builds on this legacy by offering a compact, customizable, and affordable firearm that is well-suited for a wide range of shooting applications. The pistol has quickly become popular among shooters who value its reliability, accuracy, ease of use, and compatibility with a wide range of aftermarket accessories and upgrades.

Unboxing the M400 Tread

Sig Sauer M400 Tread AR-15 Pistol, the package included the following items:

  1. The M400 Tread AR-15 Pistol
  2. One 30-round magazine.
  3. A cable lock or trigger lock secures the firearm when not in use.
  4. A user manual includes assembly, disassembly, cleaning, and maintenance instructions.
  5. A warranty card or registration form provides information on the manufacturer’s warranty and registration process.

The M400 is a sleek modular-looking AR-15 pistol. It’s a great-looking firearm and is surprisingly light.

Getting to know the M400 Tread

The Sig Sauer M400 Tread AR-15 Pistol is a semi-automatic pistol chambered in .223 Remington or 5.56 NATO, and features a 11.5-inch barrel with a free-floating M-LOK handguard.

The M400 Tread AR-15 Pistol is part of Sig Sauer’s Tread series to provide shooters with a customizable, affordable platform for novice and experienced shooters. The pistol comes with various standard features, including a single-stage trigger, ambidextrous controls, and a 30-round magazine.

One of the standout features of the M400 Tread AR-15 Pistol is its compatibility with a wide range of aftermarket accessories and upgrades. This allows users to easily modify and customize their firearms to meet their specific needs and preferences. The pistol is also designed to be easy to disassemble and maintain, with a simple takedown process and a durable, corrosion-resistant finish.

Specifications

  • Caliber: 5.56 NATO
  • Barrel Length: 11.5 inches
  • Barrel Twist Rate: 1:7
  • Overall Length: 27 inches
  • Weight: 6 pounds, 2 ounces (without magazine)
  • Magazine Capacity: 30 rounds
  • Operating System: Direct Impingement
  • Trigger: Single-stage, enhanced polished trigger
  • Handguard: Free-floating M-LOK handguard
  • Sights: Optics-ready with full-length Picatinny top rail
  • Finish: Black anodized.
  • Grip: Tread branded pistol grip
  • Brace: SBA3 Brace- No longer available with a brace
  • UPC: 798681618286
  • MPN: PM400-11B-TRD
  • MSRP: $1099.99

Action

The Sig Sauer M400 556 Nato Tread AR-15 Pistol PM400-11B-TRD utilizes a direct impingement gas operating system, a traditional and reliable method of cycling rounds in AR-15 rifles.

The Sig Sauer M400 556 Nato Tread AR-15 Pistol PM400-11B-TRD also features a rotating locking bolt design, a common feature in AR-15 rifles. This design ensures that the bolt stays locked in place until the pressure from the fired round has dropped to a safe level. This helps to ensure that the rifle functions safely and reliably.

Barrel and Handguard

The Sig Sauer M400 556 Nato Tread AR-15 Pistol PM400-11B-TRD features an 11.5-inch barrel with a 1:7 twist rate. This barrel length makes it a compact and maneuverable firearm, making it ideal for shooting in tight spaces or engaging targets at close range. The barrel is made from high-quality materials and features a durable black anodized finish that provides corrosion resistance and longevity.

Additionally, the M400 Tread is equipped with a free-floating M-LOK handguard. The handguard is light and comfortable to grip. The MLOK configuration allows attaching various accessories and upgrades, such as lights, lasers, and more. The M-LOK system is popular for its versatility, strength, and easy customization. The handguard’s free-floating design also helps improve accuracy by reducing interference from external factors such as sling tension or accidental bumps.

Overall, the 11.5-inch barrel and free-floating M-LOK handguard make the Sig Sauer M400 556 Nato Tread AR-15 Pistol PM400-11B-TRD a versatile and effective firearm that can be customized to meet your specific needs and preferences..

Bolt Carrier Group

The Sig Sauer M400 556 Nato Tread AR-15 Pistol PM400-11B-TRD features a high-quality bolt carrier group (BCG). The BCG is made from high-strength steel and features a durable black nitride finish that offers exceptional wear and corrosion resistance.

The BCG parts include a bolt, carrier, firing pin, cam pin, and retaining pin, all carefully machined and assembled to ensure consistent and reliable performance. The bolt is machined from Carpenter 158 steel and is shot-peened for added strength and durability. The carrier is machined from 8620 steel and features a staked gas key to prevent loosening over time.

The Sig Sauer M400 556 Nato Tread AR-15 Pistol PM400-11B-TRD’s BCG also includes a forward assist, which allows the shooter to manually push the bolt carrier group forward if it fails to seat fully during cycling. This can be useful in situations where the rifle may be dirty or fouled or when using certain ammunition.

Capacity, Magazines, and Caliber

The Sig Sauer M400 556 Nato Tread AR-15 Pistol PM400-11B-TRD has a capacity of 30 rounds and uses standard AR-15 magazines. The pistol is chambered in 5.56 NATO, a high-performance round widely used by military and law enforcement agencies worldwide. This caliber is known for its accuracy, high velocity, and relatively flat trajectory, making it an excellent choice for a wide range of shooting applications.

The pistol’s 30-round capacity provides ample firepower for various shooting scenarios. The ability to use standard AR-15 magazines also provides you the choice of sourcing other magazines and magazine capacities.

Controls

The M400 features a range of intuitive and reliable controls. The pistol’s ambidextrous safety selector allows for easy operation by both right- and left-handed shooters. At the same time, the oversized trigger guard provides plenty of room for larger hands or those wearing gloves.

The pistol’s charging handle is also designed for easy and comfortable operation, with an oversized surface that allows for easy manipulation even when wearing gloves. The pistol’s bolt catch and release are both in easy-to-reach positions, making it easy to lock the bolt back or release it quickly and smoothly.

The Sig Sauer M400 556 Nato Tread AR-15 Pistol PM400-11B-TRD also features a crisp and responsive trigger, which provides a smooth and consistent pull for every shot. The trigger is designed to provide excellent accuracy and control, whether shooting for fun or more serious purposes.

I’m a fan of ambidextrous magazine releases and was also happy to see it on the M400.

Sig Sauer’s attention to detail and dedication to meeting shooters’ needs is apparent in the m400.

Ergonomics

The Sig Sauer M400 556 Nato Tread AR-15 Pistol provides exceptional comfort and control. Being a fan of the tailfin, I was disappointed to see them outlawed pending final litigation, but nonetheless, the m400’s ergonomics are on point. The pistol’s grip is contoured and textured to provide a secure and comfortable grip. The oversized trigger guard also provides plenty of room, and the weight and feel are perfect.

Overall, the Sig Sauer M400 556 Nato Tread AR-15’s ergonomics provide exceptional comfort and control. Whether shooting at the range, hunting in the field, or using the pistol for self-defense, you won’t be disappointed with this pistol’s ergonomics and overall feel.

Finish

The Sig Sauer M400 556 Nato Tread AR-15 Pistol PM400-11B-TRD’s finish is made to provide exceptional durability and resistance to wear and corrosion. The pistol features a black anodized aluminum receiver and handguard, which are both lightweight and durable.

In addition to the anodized aluminum receiver and handguard, the M400 also features a black nitride finish. The barrel, bolt carrier group, and gas block are all finished in black nitride. Nitriding is a process that impregnates the surface of the steel with nitrogen, creating a hard and corrosion-resistant surface. This finish is known for its exceptional durability and ability to resist wear and corrosion.

Regarding the look of the finish, it has that deep black finish and looks tactical and stylish!

Frame

The Sig Sauer M400 556 Nato Tread AR-15 Pistol PM400-11B-TRD features a high-quality frame. The pistol’s lower receiver is made from high-strength aircraft-grade aluminum, which is both lightweight and rugged. This material provides a solid platform for the pistol’s internal components while also helping to reduce overall weight.

The lower receiver features a flared magazine well, which makes it easier to insert and remove magazines quickly and smoothly. The pistol’s trigger guard is also oversized, providing plenty of room for shooters wearing gloves or with larger hands. Additionally, as previously mentioned, the pistol features an ambidextrous safety selector.

The Sig Sauer M400s frame also features several other enhancements that help to improve its overall performance and ergonomics. These include a textured grip surface and a Picatinny rail on the top of the receiver, which allows for easy mounting of optics and other accessories.

Sig Sauer M400 Tread

Overall, the Sig Sauer M400 556 Nato Tread AR-15 Pistol PM400-11B-TRD’s frame to provides exceptional durability and performance.. Sig Sauer M400 556 Nato Tread AR-15 Pistols frame delivers on quality.

Safety

The safety features on this pistol are built to ensure easy access and maximum safety. The pistol has a manual ambidextrous safety on the lower receiver’s left and right sides. It can be engaged or disengaged with the flick of a finger.

Additionally, the pistol has a drop safety, which ensures that the gun will not fire if accidentally dropped. This feature is essential for those who use the gun for self-defense, as it ensures that the firearm will not accidentally discharge in the event of a fall or sudden impact.

Sights

The pistol has a Magpul MBUS (Magpul Back-Up Sight) Rear Sight. This didn’t create an issue because I plan on adding optics.

The Magpul MBUS (Magpul Back-Up Sight) Rear Sight is a durable and lightweight backup iron sight. It provides reliable target acquisition and aiming accuracy in the event of an optic failure. It is made from impact-resistant polymer and features a spring-loaded flip-up design allowing quick deployment and stowing.

The MBUS Rear Sight has a dual aperture design, with a small aperture for precision shooting and a large aperture for faster

target acquisition. The sight is adjustable for windage and has positive detents that click into place to ensure consistent zeroing.

The sight easily mounts on the M400’s MIL-STD-1913 Picatinny rail. It has a low profile that allows it to co-witness with most red dot sights and other optics.

Trigger

The M400’s trigger is a single-stage trigger, providing a consistent pull weight throughout its travel. It has a clean and crisp break and a quick reset. I didn’t have my gauge at the time of this review, but I will update it with pull weight. Although I typically upgrade triggers on many of my firearms, at this point, I wouldn’t feel the need to upgrade the M400’s trigger.

M400 Tread Aftermarket Parts Compatibility

The Sig Sauer M400 556 Nato Tread AR-15 Pistol PM400-11B-TRD is a highly customizable firearm compatible with a wide range of aftermarket parts. Some of this pistol’s most popular aftermarket parts include different handguards, trigger upgrades, and optics mounts.

One popular handguard upgrade for the Sig Sauer M400 is the Geissele Automatics Super Modular Rail (SMR). The SMR is a lightweight and durable handguard that is easy to install and provides users with various attachment options for accessories such as lights, lasers, and grips.

Another popular aftermarket upgrade for this pistol is the Timney Triggers AR-15 Competition Trigger. This trigger provides users with a crisp and clean break, reducing trigger pull weight and improving accuracy. The trigger is easy to install and is designed to provide users with a smoother shooting experience.

Lastly, the pistol is also compatible with a variety of optics mounts, including the popular Vortex Optics Spitfire AR Prism Scope. This scope provides users with high accuracy and visibility, making it an excellent choice for target shooting and self-defense applications.

I would love to hear from you in the comments about some of the parts you are running on your M400.

Sig Sauer M400 Tread AR-15 Pistol Review Wrap

I had heard nothing but good things about the Sig Sauer M400 Tread AR-15 Pistol, and after a closer look, it is easy to see why. The pistol’s overall build quality is top-of-the-line, it felt solid and well-made

At an MSRP OF $1,099, the price point is higher than some would like, but they often go on sale and can be found at solid discounts. Overall, the Sig Sauer M400 Tread AR-15 Pistol is a highly customizable reliable, great-looking firearm. Considering everything, I feel it makes an excellent choice for those looking for a top-of-the-line AR-15-style pistol.

Sig Sauer M400 Tread AR-15 Pistol Review

Sig Sauer M400 Tread AR-15 Pistol Review FAQs

What is the maximum effective range of the Sig Sauer M400 Tread AR-15 Pistol?

The maximum effective range of the Sig Sauer M400 Tread AR-15 Pistol is around 300-400 yards.

What is the caliber of the Sig Sauer M400 Tread AR-15 Pistol?

The Sig Sauer M400 Tread AR-15 Pistol is chambered in 5.56 NATO/.223 Remington.

What is the barrel length of the Sig Sauer M400 Tread AR-15 Pistol?

The barrel length of the Sig Sauer M400 Tread AR-15 Pistol is 11.5 inches.

Author

  • Michael Hodgdon

    A firearm, shooting, outdoor, and hunting enthusiast for over 35 years. Thank you all for the suggestions on topics you would like to see; we'll keep posting as you keep sending them in. Please comment; we will try to answer all comments quickly.

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