Sig Sauer SIGM400 TREAD COIL Rifle


The TREAD is engineered to deliver exceptional quality, performance and comes standard with the most sought-after features for today’s AR platform rifles

Sig Sauer SIGM400 TREAD COIL Rifle

The Sig Sauer SIGM400 TREAD COIL Rifle sets a new standard in performance and value in the AR category. With installed accessories including ROMEO5 Red Dot Sight, 2 Stage Match Trigger, and 13” lightweight handguard, the COIL is the perfect rifle package for the avid user or first-time buyer. Other features of the TREAD COIL include the precision 16” stainless barrel, ambidextrous controls, and 6-position Magpul SL Stock.The M400 TREAD COIL is an aluminum frame rifle with a 16” stainless steel barrel featuring a factory-installed and zeroed ROMEO5 TREAD optic, a lightened free-float M-LOK™ 13” TREAD handguard, a TREAD Matchlite™ Duo trigger, TREAD vertical foregrip, telescoping stock, 3-prong flash hider, ambidextrous controls, and is chambered in 5.56 NATO.

Sig Sauer SIGM400 TREAD COIL Rifle

Additional TREAD branded accessories can be purchased separately and include:

– M-LOK handguard with lightening cuts to reduce weight, available in 13” and 15” lengths;

– 3 chamber compensator;

– Ambidextrous charging handle made of aircraft-grade aluminum and a dual roll pin design;

– ROMEO5 optic featuring a 2MOA dot with ten illumination settings, MOTAC, and 50k battery life;

– Flip-up front and rear iron sights that are easy to install, adjustable, and deploy quickly;

– 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;

– Factory upgraded flat blade, single-stage trigger.

Sig Sauer SIGM400 TREAD COIL Rifle is a perfect gun to have in your shelf today.


  • Free Floating M-LOK Enhanced Handguard
  • SIG Matchlite Trigger
  • ROMEO5 TREAD Red Dot
  • Ambidextrous charging handle made of aircraft-grade aluminum and a dual roll pin design


5.56x45mm NATO
30+1 Round
7 Pound
Overall Length
30.8 Inches
Barrel Length
16 Inches
Barrel Contour
Action Type
Stock Type
Stock Material
Stock Color
Trigger Type
Two Stage
Threaded Muzzle
Barrel Finish
Frame Material
Muzzle Device
Scope Included
Frame Finish
Magazine Style
Country of Origin
United States of America
Included Mounts

Sig Sauer SIGM400 TREAD COIL Rifle | Sig Sauer M400 for Sale

Sig Sauer M400 for Sale

All new SIG TREAD is now available in 4 models: SIG Sauer M400 TREAD Snakebite, SIG Sauer TREAD 5.56 Rifle, SIG Sauer TREAD 5.56 Pistol, and the larger caliber SIG Sauer TREAD 308 Rifle. The SIG Sauer TREAD series was created to fill the demand for a high-quality rifle at an entry-level price point. Built with all the most in-demand features on an AR platform, at a price point that makes sense. Every TREAD Rifle and Pistol is produced in the U.S.A, using high-quality materials and expert manufacturing techniques. Don’t buy a cheap quality AR Platform, Buy a Quality SIG Sauer TREAD at an affordable price! We ship our Sig Sauer SIGM400 TREAD COIL Rifle worldwide without any customs problems.

SIG TREAD AR-15/AR-10 Rifles For Sale

SIG TREAD AR-15/AR-10 Rifles For Sale

We didn’t set out to make just any M4. Instead, we used the innovation, performance, and attention to detail that defines other SIG rifles to evolve the platform. The result is the SIGM400, a superior system offering advanced features available right out of the box that was once only found on the after-market. SIG SAUER, Inc. is pleased to introduce the M400 TREAD COIL to the expanding line of TREAD products. The M400 TREAD COIL is an enhanced version of the popular M400 TREAD Rifle with the most popular TREAD branded accessories including the ROMEO5 TREAD Red Dot sight, match trigger, lightweight handguard, and vertical foregrip that come factory installed.


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