SIG SAUER M400 TREAD RIFLE 5.56 NATO 30 RDS

SIG Sauer M400 TREAD is a semi-automatic rifle in 5.56 NATO caliber, AR-15 type, featuring a 406 mm stainless steel barrel, free-floating M-LOK handguard, and a six-position telescopic stock. The rifle is ready for optics installation and is suitable for sport shooting enthusiasts who wish to further customize it with grips, sights, and other compatible accessories.

Suitable for use in

• Sport target shooting

• Dynamic shooting sports

• Practice at the shooting range

• Shooting from various positions

• Use with red dot or optical sights

• For shooters requiring an adjustable stock

• Creating a setup suitable for both right- and left-handed users

• Installing M-LOK accessories

• For users seeking a customizable AR-15 type rifle

• Installation of a suppressor or other suitable muzzle device

Why choose the SIG Sauer M400 TREAD?

• Popular 5.56 NATO caliber

• 406 mm or 16-inch barrel

• Stainless steel barrel

• 1:8" twist rate suitable for various bullet weights

• 1/2"-28 muzzle thread

• Mid-length gas system

• Semi-automatic direct gas impingement operation

• Free-floating aluminum handguard

• M-LOK accessory mounts

• Full-length top Picatinny rail

• Optics-ready design

• Single-stage polished and hard-coated trigger

• Curved trigger

• Ambidextrous controls

• Six-position Magpul SL-K telescopic stock

• Polymer pistol grip

• Receivers with Hard Coat Anodized finish

• Forward assist

Technical specifications

• Manufacturer: SIG Sauer

• Model: M400 TREAD 1.0

• Type: semi-automatic rifle

• Platform: AR-15

• Intended use: sport target shooting and practice at the range

• Caliber: 5.56 NATO

• Operating principle: semi-automatic

• Gas system: direct impingement

• Gas system length: mid-length

• Barrel length: 406.4 mm

• Approximate barrel length in inches: 16"

• Barrel material: stainless steel

• Twist rate: 1:8"

• Muzzle thread: 1/2"-28

• Trigger: single-stage, polished and hard-coated

• Trigger shape: curved

• Safety: manual

• Controls: ambidextrous

• Stock: Magpul SL-K telescopic stock

• Stock positions: 6

• Grip: polymer pistol grip

• Handguard: free-floating aluminum handguard

• Accessory mounts: M-LOK

• Top optics rail: Picatinny

• Magazine type: AR-15

• Manufacturer-supplied magazine: one 30-round polymer magazine

• Receiver finish: Hard Coat Anodized

• Overall length: approximately 782 mm

• Width: approximately 64 mm

• Height: approximately 191 mm

• Weight: approximately 3.2 kg

• Forward assist: present

• Open sights: not specified in the manufacturer’s standard package

• Optical sight: not included according to the manufacturer’s standard description

• Color: black

Included in the package

• SIG Sauer M400 TREAD 5.56 NATO semi-automatic rifle

• According to the manufacturer, one 30-round polymer magazine

• Manufacturer documentation

Please verify the exact delivery set, magazine capacity, and included accessories with Jahipaun before purchase. The package supplied for the European market may differ from what is described on the SIG Sauer USA product page.

Frequently Asked Questions

How long is the SIG Sauer M400 TREAD barrel?

The barrel length is 406.4 mm or 16 inches. It is a stainless steel barrel with a 1:8" twist rate.

Does the rifle come with an optical sight?

The official standard package for product code RM400-16B-TRD does not include an optical sight. Red dot, optical sight, and if necessary, mechanical sights must be selected separately.

What does a 1:8" twist rate mean?

This means the bullet makes one full rotation in eight inches, or about 203 mm, inside the barrel. This twist rate allows the use of various 5.56 NATO bullet weights, but the most accurate ammunition should be determined by testing with your specific rifle at the range.

Can accessories be mounted on the M400 TREAD handguard?

Yes. The free-floating handguard features M-LOK attachment points and a Picatinny rail on top of the receiver. When installing accessories, always use quality mounting hardware suitable for the accessory’s weight and attachment type.

Can a suppressor be installed on the rifle?

The barrel muzzle thread is 1/2"-28. The suppressor or other muzzle device must precisely match this thread, the 5.56 mm caliber, and the rifle’s operating principle. After installation, always check alignment, rifle function, and point of impact.

Can .223 Rem ammunition be used in a 5.56 NATO rifle?

The rifle’s official caliber marking is 5.56 NATO. Only use ammunition permitted by the rifle marking and the SIG Sauer user manual. Do not choose ammunition based solely on external similarity; if in doubt, consult a qualified gunsmith or dealer.

Is the SIG Sauer M400 TREAD suitable for left-handed users?

The rifle features ambidextrous controls, making it easier to configure for left-handed users. However, the charging handle and case ejection follow standard AR-15 design, so it is advisable to try the ergonomics before purchase.

What are the requirements for purchasing this rifle?

This is a civilian-restricted firearm. To purchase and possess the rifle in Estonia, you must have a valid acquisition or firearms license, and the transfer is carried out according to firearms law and the seller’s instructions.

When is the SIG Sauer M400 TREAD the right choice?

The M400 TREAD is ideal for shooters seeking a factory-configured, highly customizable AR-15 type semi-automatic rifle. The 406 mm barrel, mid-length gas system, adjustable stock, and M-LOK handguard provide a practical foundation for range and dynamic shooting configurations.

If your main goal is maximum precision from a rest, a model with a heavier-profile barrel and a stock or chassis designed for precision shooting may be more suitable. For more compact use, a shorter platform may be more convenient, but its legality, noise, muzzle pressure, and reliability require separate consideration.

Recommendations

We recommend first selecting an appropriate sight for the intended use, then choosing other accessories. For dynamic short-range target shooting, a quality red dot is suitable, while for small targets and longer distances, a low-magnification optical sight may be more practical. Since the standard package does not include sights, always check the specific delivery set before purchase.

Do not overload the handguard with unnecessary accessories. Every grip, light, and other attachment increases the front-end weight and can affect balance. After installing optics or a muzzle device, always confirm the point of impact at a certified range.

The direct impingement system requires regular cleaning and proper lubrication. Before maintenance, ensure the rifle is completely unloaded, the magazine is removed, and all ammunition is cleared from the work area. Use only spare parts, ammunition, and maintenance tools in accordance with the manufacturer’s instructions.

Customizable AR-15 type rifle for sport shooting

The SIG Sauer M400 TREAD RM400-16B-TRD combines a 406 mm stainless steel barrel, free-floating M-LOK handguard, adjustable Magpul SL-K stock, and 5.56 NATO caliber. It is a versatile platform for shooters who value a reliable factory setup and the ability to further configure the rifle for their specific needs.

Attention! The modification of the weapon may vary, ask the Jahipaun stores for more information.