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Sig Sauer M400 TREAD Coil 5.56 NATO Rifle with ROMEO5 Red Dot


Outfitted for performance out of the box, the TREAD COIL is fully configured with some of the top Tread accessories.

The TREAD COIL sets a new standard in performance and value in the AR category. With installed accessories including ROMEO5 Red Dot Sight, Flat Blade Enhanced 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 is an optics ready, aluminum frame rifle. The TREAD features a 16″ stainless steel barrel with a free-floating M-LOK handguard, ambidextrous controls, a Magpul SL-K 6-position telescoping stock, a mid-length gas system, and is available in 5.56 NATO.


  • ROMEO5 Tread Red Dot
  • Magpul SL-K Stock
  • Sig Match Lite Trigger
  • Vertical Grip
  • Ambidextrous Controls


  • UPC: 798681632381
  • Model #: RM400-16B-TRD-COIL
  • Caliber: 5.56 NATO / .223 Remington
  • Magazine Capacity: 30rd
  • Overall Length: 30.8″
  • Overall Width: 2.5″
  • Height: 7.5″
  • Threads: 1/2″-28 tpi
  • Barrel Length: 16″
  • Barrel Material: Stainless Steel
  • Twist: 1:8
  • Operating System: Direct Impingement
  • Stock: Magpul SL-K
  • Handguard: Free-floating M-LOK
  • Trigger: Sig Match Lite
  • Accessories: Vertical Grip
  • Sight: SIG Romeo5 Tread Red Dot
  • Weight: 7 lbs


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