Sig Sauer TREAD M400 AR-15 5.56 NATO Rifle - 16"

In stock

Sig Sauer TREAD M400 AR-15 5.56 NATO Rifle - 16"


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

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
Manufacturer Sig Sauer
Finish No
Barrel Length 16"
Caliber 5.56
Configuration No
Option No
Gas Length No
Height No
Rail Length No
Mount No
Profile No
Reticle No
Co Witness No
Size No
Item Category (only for Taxify) No