SIG Sauer M400 TREAD rifle - first shooting test and exclusive video

With the motto the “New Face of Freedom”, SIG Sauer has just announced the introduction of its entry-level rifle, the M400 TREAD, based on the M400 Modern Sporting Rifle (MSR). The M400 uses a direct impingement gas operating system, common to the traditional AR platform, with a rotating locking bolt.

The umpteenth poor man’s gun “with a good value for money”?

SIG Sauer M400 TREAD rifle
This is the SIG Sauer M400 TREAD rifle in stock configuration. Only the BUIS and red dot optic are added.

As you can expect from SIG Sauer, nothing like that. At 951 USD (MRSP), the M400 Tread is indeed a no-compromise, high-quality premium rifle, just with an affordable price tag. As explained by Tom Taylor, SIG’s Chief Marketing Officer and Executive Vice President, the new rifle “is packed with innovation and flexibility, and does not sacrifice the quality that our consumers demand from SIG.” The base model sports in fact a lot of desirable features that in other manufacturers’ products are usually quite expensive upgrades.

SIG Sauer M400 TREAD rifle with 2 MOA Red Dot optic mounted
The SIG Sauer M400 TREAD rifle we tested had a branded SIG Romeo 5 with a 2 MOA Red Dot optic mounted.

In particular, right out of the box the Tread rifle features a factory-installed, aluminum, free floating M-LOK handguard for improved accuracy. Equipped with a 16” stainless steel barrel that features a 1:8 twist (a first for SIG guns that normally sport a 1:7 twist) and chambered for the ever popular 5.56mm NATO cartridge, the M400 TREAD is optics ready too. The lower receiver features completely ambidextrous controls, with a single-stage polished/hard-coat trigger, a Magpul SL-K 6 position telescoping stock, while the flat top upper uses a mid-length gas system.

Watch our exclusive all4shooters video: first shooting test with the brandnew SIG Sauer M400 TREAD rifle

Most importantly, the M400 TREAD is designed to “grow”: with its launch, SIG Sauer has created a full line of dedicated accessories to customize the rifle. 

The TREAD branded accessories – that require no proprietary tools or armorer training – include both a 13” and 15” long M-LOK ultralight handguards with the ability to accept direct on accessories and Picatinny rails; a 3 chamber muzzle compensator; an ambidextrous charging handle made of aircraft grade aluminum and a dual roll pin design; a ROMEO5 optic featuring a 2MOA dot with ten illumination settings, MOTAC, and 50k battery life.

The 16" Stainless steel barrel of the SIG Sauer M400 TREAD rifle
The fully floated 16" Stainless steel barrel features a 1:8 twist. The stock muzzle flash hider is a open prong design.
Impingement gas operating system of the SIG Sauer M400 TREAD rifle
The SIG Sauer M400 TREAD uses a traditional direct impingement gas operating system.

Additional accessories include easy to install and quickly deployable adjustable flip-up front and rear iron sights; an M-LOK front sight adapter with co-witness height made of lightweight aluminum; multiple configurations of M-LOK grip kits made of high strength polymer and a factory upgraded flat blade, single stage trigger

But why offer a SIG Sauer entry level rifle now?

The flip-up rear iron sights of the SIG Sauer M400 TREAD rifle
The quickly deployable adjustable flip-up rear iron sights, cowitnessed with the SIG Romeo 5 red dot optic.
All controls of the SIG Sauer M400 TREAD rifle
All controls of the SIG Sauer M400 TREAD rifle are fully ambidextrous.

In the USA, there’s a trend to build the cheapest possible MSR rifle, in a probable attempt to compete against AK type firearms. Many of these AR-15 and M4 are sold at prices below 500 dollars. Many will argue that the MSR is the modularity heaven, and that it is still possible to “build up” these guns; but this is not the case any more at a less than 500-dollar mark, with out of spec parts, mediocre quality and questionable sources for materials.

The stock of the SIG Sauer M400 TREAD rifle
The SIG Sauer M400 TREAD uses a Magpul SL-K 6 position telescoping stock.
The optional vertical foregrip of the SIG Sauer M400 TREAD rifle
The optional vertical foregrip of the SIG Sauer M400 TREAD, mounted with additional M-LOK accessories.
The stock M-LOK handguard that the SIG Sauer M400 TREAD rifle
The stock M-LOK handguard that the SIG Sauer M400 TREAD rifle comes with.

SIG Sauer recognized that there is a market for an “entry level” AR rifle offered at a reasonable price, but refused to be part of a “lowest bid war”.

SIG did not compromise on any of the base materials or technology, therefore offering a base platform that can be built upon using renown SIG modularity: the M400 TREAD.

The TREAD, combined with its branded accessories, both premium SIG Sauer products offered at a budget-friendly price, allows the owner to easily, and affordably, tailor and configure their rifle to their preferences.

How does the M400 TREAD perform?

Shooting with the SIG Sauer M400 TREAD rifle
Shooting the SIG Sauer M400 TREAD rifle at the Area 51 range in the SIG Sauer Academy.

We had the chance to shoot the M400 TREAD at the SIG Sauer Academy in a very limited introductory event, in both static, accuracy focused drills in which we also zeroed the rifle, and action-packed, dynamic drills from scant inches all the way to hundreds to yards from the targets, both steel and paper.

We used the full Area 51 range and a specific, time limited course that tested our performance as well as the rifle’s.

SIG Sauer M400 TREAD target at 100 yards (91,4m)
SIG Sauer M400 TREAD target at 100 yards (91,4m), using Elite Performance .223 55gr FMJ ammunition.

The M400 TREAD groups very nicely using SIG Sauer Elite Performance .223 55gr FMJ ammunition; shooting off the ground in a prone position at 100 yards with the SIG Sauer ROMEO 5 reflex sight with 2 MOA dot yields a .95 inch (24mm) five round groups.

In the hundreds of rounds fired, we have not witnessed a single failure. 

The TREAD handles nicely, has a mild recoil and ergonomically is almost perfect, although there were a few mold flashes from the pistol grip that chafed our fingers – possibly because the guns we tested were pre-production models.

Testing the SIG Sauer M400 TREAD rifle
Even without the three chamber muzzle compensator, the muzzle flip and recoil of the SIG Sauer M400 TREAD is quite mild.

We also found that in heavy shooting scenarios the M-LOK handguard contact area with the barrel, just forward of the upper receiver, becomes extremely hot: the handguard itself in this case is warm but not unbearably so. Using shooting gloves – a given, in the case of intensive shooting classes anyway! - obviously solves both.

Accessories packed of the SIG Sauer TREAD
The new SIG Sauer TREAD branded aftermarket accessory program is extensive and complete, including a red-dot optic, the SIG Romeo 5.
SIG Sauer TREAD rifle and accessories in its case
All of the presently available SIG Sauer TREAD accessories are presented in a Dealer's case... no, it's not available to the public at this time.

The TREAD branded accessories we tested with the gun are premium quality; the muzzle compensator effectively kills the already mild recoil of the M400, allowing blazing fast recovery of the target, the single-stage trigger is excellent, possibly the best we’ve tried at this price point. The adjustable flip-up sights are all steel and of very accurate manufacture. The Romeo 5 red dot optic is a steal at 150 dollars!

Our opinion is absolutely positive; even completely decked out, for a MRSP below 1500 dollars, with the trigger, charging handle, compensator, handguard, Romeo 5 optic, the gun is priced at what competitors offer for a premium – but bare – gun. Do the math…

By now M400 TREAD is available only in the U.S.A. For Europe a release date it is not planned yet, but we will keep you updated.

For more information please visit SIG Sauer website.

This article is also available in this language: