The M400 TREAD Pistol

Sept. 5, 2019

SIG SAUER, Inc.'s M400 TREAD Pistol is a premium entry-level rifle-caliber pistol, that’s fully compatible with existing TREAD branded accessories. The M400 TREAD pistol is an optics ready, aluminum framed pistol that features an 11.5” nitride coated, cold hammer-forged barrel, with a free-floating M-LOK handguard, a single-stage polished trigger, ambidextrous controls, a KAK Industry Shockwave Blade 2.0 brace, a carbine-length gas system, and is available in 5.56 NATO.


  • Total Length: 27”
  • Height: 7.5”
  • Barrel Length: 11.5”
  • Width: 2.5”
  • Weight (incl. magazine): 6lbs
  • Barrel Twist: 1:7”

The M400 TREAD Pistol is compatible with the full-line of existing TREAD accessories.  Additionally, a lightened 10.5” M-LOK handguard accessory has been introduced to the TREAD accessory line-up to be utilized with the M400 TREAD Pistol.  

Current TREAD accessories include: a 3-chamber compensator; an ambidextrous charging handle made of aircraft grade aluminum; a ROMEO5 optic featuring a 2MOA dot with ten illumination settings, MOTAC, and 50k hour battery life; flip-up front and rear iron sights that are easy to install, adjustable, and deploy quickly; an 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; and a factory upgraded 2-stage trigger.

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