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Sig Sauer

Sig Sauer SIGM400

Product Code : 798681597765

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Mfg Item #: RM400-16B-TRD

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The M400 TREAD is an optics ready, aluminum frame rifle. 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.

The TREAD branded accessories 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



  • OPERATING SYSTEM: Direct Impingement
  • CALIBER: 5.56 NATO
  • OVERALL LENGTH: 30.8 in (782 mm)
  • OVERALL WIDTH: 2.5 in (64 mm)
  • HEIGHT: 7.5 in (191 mm)
  • BARREL LENGTH: 16 in (406 mm)
  • WEIGHT: 7 lbs (3.2 kg)
  • TWIST RATE: 1:8
  • MAG TYPE: AR-15

Determined at checkout.