SIG Sauer M400 Xseries 5.56 NATO 16" 30-Round Rifle

The SIG Sauer M400 X-Series 5.56 NATO 16" rifle represents the modern standard for law enforcement, military, and civilian tactical operators seeking a dependable, adaptable platform. Purpose-built for precision and speed, this semi-automatic rifle delivers the accuracy and reliability demanded in duty and training environments where performance margins are measured in seconds and accuracy requirements are measured in inches. The 16-inch barrel strikes the proven balance between portability and muzzle velocity that has defined effective carbine design across professional and civilian markets.

Built on SIG's refined piston-driven operating system, the M400 X-Series cycles with the mechanical consistency that separates duty-grade platforms from consumer-grade offerings. The 16-inch barrel channels 5.56 NATO rounds to optimal velocity for both intermediate and extended-range engagement, while the rifle's 9.94-pound weight maintains shootable ergonomics during extended patrol or range sessions without fatigue penalties. The 30-round magazine capacity delivers the standard ammunition load expected in 5.56 platforms, enabling sustained fire without frequent reloads—a critical factor in force-on-force scenarios or high-volume training days.

Law enforcement patrol units, military transition teams, and professional civilian operators benefit most from this platform's modular receiver architecture and rail integration, which accommodate optics, lights, and accessories across standard Picatinny mounting points. The rifle performs reliably across temperature extremes and adverse conditions—a prerequisite for duty weapons and tactical training rifles. Magazine compatibility with standard AR-pattern 5.56 platforms ensures parts and ammunition interchangeability across organizational armories and training environments.