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Sig Sauer M400



Cartridge:5.56x45mm NATO

Sig Sauer M400 Tread Semi-Automatic Centerfire Rifle

Sig Sauer M400 Tread is an optics ready, aluminum frame rifle. The Tread features a 16” stainless steel barrel with a free-floating M-LOK handguard, a single-stage polished/hard-coat trigger, ambidextrous controls, a Magpul SL-K 6 position telescoping stock, a mid-length gas system, and is available in 5.56 NATO.


Sig Sauer M400 Tread Features

  • M-LOK handguard with lightening cuts to reduce weight
  • Ambidextrous controls
  • Free floating handguard
SIG Sauer M400 Elite - RifleShooter
Sig Sauer M400

Made In United States of America


Sig Sauer M400 Tread Specifications

SIG Sauer is in negotiations with several agencies in the U.S. considering the M400 for department purchase. McDevitt pointed out that select design features of the SIG Sauer M400 product line offer both citizens and police officers even more to choose from. At this time, the hottest-selling model is the M400 Enhanced FDE with flat dark earth forearm and stock, with SIG Sauer offering the same finish on the upper and lower receivers. The company offers many of the features customers must purchase on their own “out of the box,” which is a refreshing concept.

The M400 has a 16-inch chrome-lined barrel with a 1:7-inch twist. This flattop shooter comes with a detachable carry handle sporting A2-style adjustable rear sights. The entire package weighs just 6½ pounds empty.


The trigger is listed as 7.6 pounds, but my Lyman trigger-pull gauge averaged my sample at 7.1 pounds. I found the trigger smooth to operate with a clean break.

The forearm is a standard carbine-length six-inch design. The buttstock is of the six-position adjustable M4 style

Sig Sauer M400 Rifle Product Information

Cartridge 5.56x45mm NATO
Action Type Semi-Automatic
Capacity 30+1 Round
Weight 7 Pound
Overall Length 30.8 Inches
Barrel Length 16 Inches
Barrel Finish Stainless
Twist 1:8
Threaded Muzzle Yes
Threads 1/2″-28
Hand Right
Frame Material Aluminum
Frame Finish Black
Youth No
Stock Type Collapsible
Stock Material Synthetic
Stock Color Black
Muzzle Device Three-Prong
Scope Included No
Magazine Style Detachable
Fluting No
Country of Origin United States of America
Trigger Type Single Stage
Safety Selector
Included Mounts Yes
SIG SAUER M400 Tread -
Sig Sauer M400 Available


Get The Sig Sauer M400 Tread From

SIG M400 is a company name that is synonymous with quality firearm design and execution. Touring the factory, I saw new machining capabilities and quality-control measures operating in perfect function.

At the time of my visit, the company had just invested millions to further its goal of being the finest maker of small arms in the world. At the SIG Academy I got my hands on the entire product line and was permitted to shoot everything from pistols to sniper rifles.

As a full-time LE firearms instructor and former carbine instructor-trainer for the state police academy, I seldom pass up an opportunity to fire a well-made carbine. And that’s exactly what the SIG M400 is.

The SIG Sauer perspective, according to Jarrod McDevitt, rifle product manager, is that the M400 is customer driven with direct requests from LE that specifically desired an M4-style carbine.



Sig Sauer M400 Tread Semi-Automatic Centerfire Rifle
Sig Sauer M400


Is the SIGM400 a good rifle?
Reliability wise, I had zero issues. This thing went through mag after mag of mixed grain FMJ rounds, green-tip rounds, and some steel-case 55-grain ammo, and it didn’t skip a beat. I only had half of a box left of 77-grain SIG Elite Match Grade ammo, but with the 1:7 twist it shot like a



SIG Sauer M400 TREAD Rifle Review -
Sig Sauer M400 Tread Semi-Automatic Centerfire Rifle
Is the SIGM400 a pistol?
The SIG M400 TREAD pistol is a direct-impingement-operated AR-15 with an 11.5-inch barrel and a carbine-length gas system. While the rifle has a stainless steel barrel left in the white, the pistol has a carbon steel barrel with a black-nitride finish
Review: SIG Sauer M400 Elite -
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