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Sig Sauer

Sig Sauer SIG SAUER TREAD M400 AR-15 5.56 NATO RIFLE - 16" NIB

Product Code : Not Specified


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
  • 3 chamber compensator
  • Ambidextrous charging handle made of aircraft grade aluminum and a dual roll pin design
  • 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
  • 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.