SIG Sauer RM40016BTRDV210 M400 556 5.56 NATO Rifle

The SIG SAUER M400 TREAD 5.56 NATO 16-inch rifle is purpose-built for law enforcement, military, and civilian tactical operators who demand reliability, modularity, and precision in a combat-proven platform. This 10-round capacity rifle delivers the accuracy and ergonomic control necessary for both intermediate-range engagements and close-quarters operations. The M400 TREAD represents decades of SIG SAUER's engineering excellence, combining proven direct-impingement design with modern ergonomic refinements that appeal to professional end-users and serious sport shooters alike.

At the core of this rifle is a free-floating M-LOK enhanced handguard that maintains zero shift while distributing heat evenly across the barrel profile, eliminating the harmonic distortion that impacts consistency. The lightweight yet rigid construction provides excellent ergonomic control and intuitive mounting for tactical lights, lasers, grips, and handstops without sacrificing balance or maneuverability. The ambidextrous safety selector accommodates both right and left-handed shooters, while the integrated quick-detach (QD) mounting system on the lower receiver ensures rapid optic acquisition and retention. At 8.45 pounds and 34.5 inches in overall length, the M400 TREAD delivers a manageable platform suitable for entry work, patrol operations, and precision shooting at distance.

Law enforcement agencies, military units, and competitive shooters will find the M400 TREAD's modular design essential for mission adaptation and long-term accessory integration. The 16-inch barrel strikes the optimal balance between velocity and portability—delivering 5.56 NATO performance in confined spaces while maintaining effective ranges to 600 meters with proper optics. The 10-round magazine configuration complies with restrictive state regulations while offering sufficient round count for tactical deployment. Installation of optics, suppressors, or rail-mounted systems integrates seamlessly with standard AR-pattern components, ensuring compatibility with existing armorer support and operator familiarity across professional teams.