Sig Sauer M400 Tread 5.56 NATO Romeo5 Red Dot Rifle

The SIG SAUER M400 Tread Coil 5.56 Romeo5 Red Dot is a modern sporting rifle purpose-built for tactical shooters, law enforcement, and civilian marksmen who demand reliable performance in dynamic environments. This 5.56 NATO platform combines SIG's proven engineering with the rapid-target-acquisition capabilities of the integrated Romeo5 red dot sight, making it an ideal choice for home defense, precision rifle courses, and duty applications where speed and accuracy are non-negotiable.

Built on a 16-inch barrel, the M400 Tread Coil delivers the ballistic performance and handling characteristics operators expect from an intermediate-length gas system. The rifle cycles 5.56 NATO and .223 Remington ammunition, with a 30+1-round capacity that provides tactical flexibility without excessive weight penalty. The coil operating system reduces felt recoil and improves controllability during rapid fire strings—critical for law enforcement transitions or defensive scenarios. The included SIG Romeo5 red dot optic offers quality glass, intuitive brightness adjustment, and the rugged mounting interface that has proven itself across military and civilian platforms.

This rifle excels for shooters transitioning from service rifles or those building a primary home defense system with minimal setup time. The 30.8-inch overall length balances maneuverability in tight quarters with sight radius benefits, while the black finish resists corrosion and maintains low visibility. Installation is straightforward—the Romeo5 comes mounted and zeroed at the factory, allowing users to deploy immediately. The included 30-round magazine and forward-mounted optic platform support rapid reloads and aftermarket accessory integration, making the M400 Tread Coil a versatile foundation for continued customization.