Sig M400 Sdi 556 11.5" Bk 30rd Brace

The SIG Sauer M400 SDI 556 11.5" Black pistol with 30-round magazine and pistol brace is a compact, semi-automatic platform engineered for operators requiring a short-barreled, maneuverable configuration. The 11.5-inch threaded barrel in 5.56 NATO delivers ballistic performance optimized for close-quarters and transitional environments while maintaining the velocity necessary for effective terminal performance within intermediate ranges. The anodized black finish provides corrosion resistance and a low-visibility profile.

The threaded barrel accommodates standard muzzle devices—flash hiders, compensators, or suppressors—allowing customization based on mission requirements. The 30-round capacity standard magazine provides sufficient firepower for duty and training scenarios. The pistol brace configuration positions this firearm as a highly portable option for operators who prioritize compactness without sacrificing ergonomics or handling characteristics. The AR-platform design ensures compatibility with a mature ecosystem of aftermarket components, allowing users to optimize optics mounting, controls, and accessories to individual requirements.

This platform serves law enforcement agencies, military personnel, and civilian operators who require a duty-grade, short-barreled 5.56 system for patrol carbine, entry support, vehicle operations, or home defense roles. The M400 SDI represents SIG Sauer's professional-grade engineering applied to a compact form factor—ideal for scenarios where barrel length must be sacrificed for maneuverability without compromising reliability or accuracy. The combination of proven AR ergonomics, threaded capability, and SIG Sauer's quality standards makes this configuration a legitimate choice for serious users prioritizing compact capability in 5.56 NATO.