Sig Sauer M400-DH3 223 Wylde AR-15 Rifle - 30 Round - 16"

Manufactured by Sig Sauer
SKU: RM400-SDI-16B-DH3
MPN: RM400-SDI-16B-DH3
Manufactured by Sig Sauer
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Standard orders will ship out in 1 business days or less if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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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



This M400-DH3 AR-15 rifle was developed in close cooperation with Sig’s competition division and is the result of two years of testing and collaboration. Made by Sig Custom Gunworks, this rifle comes with full ambidextrous controls from the factory, as well as premium parts from the muzzle brake all the way back to the stock. Those looking for a competitive edge will especially appreciate the Timney trigger and fluted barrel, both of which serve to keep the gun not only lightweight, but blazing fast. The furniture is designed to keep things light and locked in, and the brake will keep you on target. In short, this rifle is what used to cost several times as much done custom, now available from the factory.

  • 5.56 NATO or 223 Remington
  • DH3 Adjustable Stock
  • 2-Stage Adjustable Timney Daniel Horner Signature Trigger
  • Low Profile 3-Gun Handguard
  • Ambidextrous Controls Including Bolt Catch/Release
  • 16" Fluted Competition Barrel chambered in 223 Wylde
  • Cerakote Finish
With the M400, Sig Sauer aims to produce a competition-ready firearm for those who are looking to get into three-gun shooting without the hassle of building a custom rifle. Throw on an optic of your choice, and this model is good to head to the competition circuit today.
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Barrel Coating
Barrel ContourFluted
Barrel Length16
Barrel MaterialStainless Steel
BrandSig Sauer
Caliber Gauge5.56 NATO
Gas System TypeDirect Impingement
Magazine Capacity30
Muzzle Device3 Chamber Compensator
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

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