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SIG Sauer M400 Tread 5.56 AR-15 Rifle - 16"

Manufactured by Sig Sauer
SKU: RM400-16B-TRD
MPN: RM400-16B-TRD
Manufactured by Sig Sauer
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$849.99 $899.99

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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 ffl@primaryarms.com.



The SIG Sauer M400 Tread 5.56 AR-15 Rifle is ready for the range straight out of the box with a 30 round Magpul PMAG and an M4 flat top upper receiver for your favorite optic. It features a 16” stainless steel barrel with a 1:8 twist rate and an adjustable gas block. The carbon steel barrel features a black Nitride finish and a three prong flash hider with a lightweight M-LOK free float handguard. The lower receiver features ambidextrous controls, an ergonomic pistol grip, and a single stage Mil-Spec trigger. Attached to the carbine length buffer tube is a Magpul MOE SL-K carbine stock. The SIG M400 Tread is a lightweight modern sporting rifle that is a great addition to any collection.

  • 16” barrel chambered in 5.56
  • Stainless steel barrel
  • Adjustable gas block
  • Lower receiver with integral ambidextrous controls
  • Ambidextrous QD end plate
  • Magpul MOE SL-K stock
  • 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 CoatingStainless Steel
Barrel ContourMedium
Barrel Length16
Barrel LiningStainless Steel
Barrel MaterialStainless Steel
BrandSig Sauer
FinishHardcoat Anodized
Gas System LengthMid-Length
Gas System TypeDirect Impingement
Handguard15 in M-LOK Rail
Magazine Capacity30
Muzzle Device3-Prong Flash Hider
Thread Pattern1/2 X 28
Twist Rate1:8
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 www.P65Warnings.ca.gov.

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