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Sig Sauer TREAD M400 AR-15 5.56 NATO Pistol - 11.5"

AR Pistol

In stock
Only 4 left

Available In Store at Auburn, WA

Ships from Distribution Facility

Sig Sauer TREAD M400 AR-15 5.56 NATO Pistol - 11.5"


The M400 TREAD is an optics ready, aluminum frame rifle.  TREAD features a 11.5” stainless steel barrel with a free-floating M-LOK handguard, a single-stage polished/hard-coat trigger, ambidextrous controls, a KAK Shockwave, 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
  • 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 WIDTH 2.5 in
  • HEIGHT 7.5 in (191 mm)
  • BARREL LENGTH 11.5 in
  • WEIGHT 5.4 lbs 
  • TWIST RATE 1:8
  • MAG TYPE AR-15

FFL Required Before Shipping.

Please have your dealer email their license to [email protected] or they can also fax it in. Please give us a few days to process the information.

More Information
Product Type AR Pistol
Manufacturer Sig Sauer
Barrel Length 11.5"
Caliber 5.56