SIG Sauer M400 Tread 5.56 AR-15 Pistol - 11.5"

Manufactured by Sig Sauer
SKU: PM400-11B-TRD
MPN: PM400-11B-TRD
Manufactured by Sig Sauer
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Handguns are regulated by the ATF have restrictions and requirements:
 •Your Entire Order will ship only to a Federal Firearm License holder
•Carriers and shipping methods are limited
•A copy of your order/invoice as well as the current FFL License for your local dealer must be emailed to ffl@primaryarms.



The SIG Sauer M400 Tread 5.56 AR Pistol is ready for the range straight out of the box with a 30 round Magpul PMAG. It features an 11.5” barrel with a 1:7 twist rate and an adjustable gas block. The carbon steel barrel features a black Nitride finish and an A2 flash hider with a lightweight M-LOK free float handguard. The lower receiver of the SIG M400 pistol features ambidextrous controls, an ergonomic pistol grip, and a single stage Mil-Spec trigger. Attached to the carbine length buffer tube is a stabilizing brace for better accuracy and handling. The SIG M400 Tread Pistol is a compact firearm that is a great addition to any collection.

  • 11.5” barrel chambered in 5.56
  • Carbon steel with black Nitride finish
  • Adjustable gas block
  • Lower receiver with integral ambidextrous controls
  • Stabilizing arm brace
  • Includes Magpul 30 round PMAG

Sig Sauer is a world-renowned firearms manufacturer with a rich history of innovation and design leadership. No other firearms manufacturer is so highly regarded and so universally respected for the quality, reliability, and safety of its products. Since 1864 they have expanded their product line to include suppressors, optics, ammo, and airguns to provide customers with a greater range of firearms and equipment.
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Barrel Length11.5
BrandSig Sauer
Caliber Gauge5.56 NATO
Weight6 lbs.
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

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