SIG Sauer M400 Tread Coil 5.56 AR-15 Rifle - Romeo 5 Red Dot - 16"

Manufactured by Sig Sauer
Manufactured by Sig Sauer
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Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal-Firearm License holder.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to



The SIG Sauer M400 Tread 5.56 AR-15 is outfitted for out-of-the-box performance with installed accessories such as the ROMEO5 Red Dot Sight with 2 MOA dot, 2 stage match trigger, and 13-inch lightweight handguard. The Tread Coil AR-15 features a 16-inch stainless steel barrel with a 1:8 twist rate, ambidextrous controls, and a six-position Magpul SL stock.

  • 16" stainless steel barrel
  • Semi-auto
  • 1:8 twist rate
  • Alloy forend
  • Polymer grip
  • M-LOK accessory rail
  • Direct impingement operating system
  • 30-round polymer magazine
  • 30.8" overall length
  • 2.5" overall width
  • 7lb weight
Sig Sauer is a world-renowned firearms manufacturer with a rich history of innovation and design leadership. No other firearms manufacturer is 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 Coating
Barrel Length16
Barrel MaterialStainless Steel
BrandSig Sauer
Caliber Gauge5.56 NATO
Gas System LengthMid-Length
Gas System TypeDirect Impingement
Twist Rate1:8

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