Sig Sauer M400 Tread Moss 5.56 NATO 16" - AR-15 Rifle

The Sig Sauer M400 Tread Moss 5.56 NATO 16" delivers everything an AR-15 should — dependable 5.56 NATO function, quality construction, and straightforward ergonomics — without asking you to pay for features you don't need.

Chambered in 5.56 NATO and running a direct impingement system, the Sig Sauer M400 Tread Moss 5.56 NATO 16" is a semi-automatic AR-15 rifle engineered for consistent performance across a wide range of applications.

Reliable Function: A proven direct impingement operating system cycles a wide range of 5.56 NATO ammunition reliably — the foundation of any dependable AR-15.

Practical Barrel Length: The 16" barrel strikes a practical balance between velocity, maneuverability, and overall weight — a versatile choice for both defensive and recreational use.

Full Aftermarket Compatibility: Standard AR-15 architecture means the full range of aftermarket components, optics, and accessories are available — configure this rifle exactly how you want it.

Durable Construction: Quality materials and a durable finish ensure this platform holds up under regular range use and long-term storage without degrading function or accuracy.

• Caliber: 5.56 NATO
• Barrel Length: 16"
• Gas System: Direct Impingement
• Handguard: Free-Float
• Muzzle Threading: 1/2x28
• Magazine Capacity: 30-Round
• Finish: Moss Green Cerakote
• Origin: Made in the USA

Fully compatible with standard AR-15 lower receivers and STANAG-pattern 5.56 NATO magazines. Works with mil-spec carbine buffer systems, standard lower parts kits, and the broad ecosystem of AR-15 aftermarket accessories.

Built from 7075 aluminum with a Moss Green Cerakote finish, this AR-15 rifle holds up to sustained use without sacrificing dimensional accuracy or function.

Equally at home on a training range or in a home defense role. A go-to configuration for shooters who want one dependable AR-15 for multiple applications.

SIG SAUER is trusted by the U.S. military and law enforcement agencies worldwide. Their AR-15 lineup delivers the same premium quality and engineering that earned SIG that trust. Made in the USA.