The SIG M400 TREAD COIL comes fully loaded, including an optic.

SIG Sauer just expanded its TREAD line of products with the introduction of the M400 TREAD COIL rifle. The TREAD COIL comes enhanced, including TREAD branded accessories like a ROMEO5 TREAD Red Dot. Additionally, the package includes a match-grade trigger, lightweight handguard, and vertical foregrip.

SIG Sauer M400 TREAD COIL Details

“The hallmark of the TREAD brand is combining innovation with value and offering consumers premium SIG SAUER products at an extremely affordable price point,” said Tom Taylor, Chief Marketing Officer, Executive Vice President, Commercial Sales, SIG Sauer. Since its introduction, the demand for the TREAD brand has been phenomenal, and based on the popularity in the market, we have grown the brand from the base M400 TREAD rifle to include the 11” TREAD Pistol, 716i TREAD, and now the M400 TREAD COIL.”

“Just like its predecessors, the M400 TREAD COIL combines innovation and value,” Taylor continued. “This rifle is unique because it comes with a factory-installed red dot optic, making it ready to go right out of the box, along with other popular features that until now, were only available through an accessory purchase. The M400 TREAD COIL delivers the freedom to have an enhanced TREAD rifle right from the store with a very advantageous price that makes this an exceptional value to the consumer.”

The M400 TREAD COIL features an aluminum frame with a 16-inch stainless steel barrel. It comes with a factory-installed and zeroed ROMEO5 TREAD optic. A lightened, free-floated M-LOK 13-inch TREAD handguard provides attachment points. A TREAD Matchlite Duo trigger, vertical foregrip, telescoping stock, 3-prong flash hider and ambidextrous controls round out the package.


  • Caliber: 5.56 NATO
  • Overall Length: 30.8 inches
  • Height: 7.5 inches
  • Overall Width: 2.5 inches
  • Barrel Length: 16 inches
  • Barrel Twist: 1:8 inch
  • Weight (including magazine): 7 pounds

Additional TREAD accessories for the M400 TREAD COIL include: a 3-chamber compensator; an ambidextrous charging handle made of aircraft-grade aluminum; flip-up front and rear iron sights that are easy to install, adjustable, and deploy quickly; an M-LOK front sight adapter with co-witness height made of lightweight aluminum; and multiple configurations of M-LOK grip kits made of high-strength polymer. For more info, please visit

M400 TREAD Branded Accessories Specs

  • M-LOK Handguard 10.5-inch $149
  • M-LOK Handguard 15-inch $149
  • Adjustable Flip-Up Sights $149
  • Ambidextrous Charging Handle $49
  • 3-Chamber Compensator $49
  • M-LOK Front Sight Adapter $29
  • M-LOK Hand Stop Kit $29

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