SIG Sauer M400 Sdi 556 5.56 NATO 11.5" 30-Round Threaded Barrel Pistol

The SIG Sauer M400 SDI 556 5.56 NATO 11.5" threaded barrel pistol represents a modern, compact alternative to traditional rifle platforms for tactical professionals and civilian shooters prioritizing maneuverability without sacrificing effective range. Built on the proven M400 platform, this 5.56 NATO pistol delivers the ballistic performance of an intermediate cartridge in a highly portable format, making it ideal for home defense, vehicle-mounted roles, or close-quarters tactical operations where space is at a premium. The 11.5" barrel length strikes an optimal balance between velocity retention and overall handling, while the threaded muzzle provides immediate suppressor compatibility for sound signature reduction in mission-critical scenarios.

Engineered with a free-floating barrel assembly and precision machining, the M400 SDI delivers consistent sub-MOA accuracy even in rapid-fire sequences, a benchmark SIG Sauer maintains across its rifle and pistol lineups. The 30-round magazine capacity provides adequate ammunition on-board for extended engagements without mid-combat reloads, while the 5.56 NATO chambering ensures access to the most widely available and cost-effective rifle ammunition in the commercial and professional supply chain. The black anodized finish protects against corrosion and wear, while the modular design allows for rail-mounted optics, lights, and accessory integration without requiring gunsmith intervention.

Law enforcement tactical units, military reserve personnel, and serious civilian preparedness advocates benefit most from the compact footprint and firepower density this platform offers. The threaded barrel accepts industry-standard 1/2x28 suppressors and muzzle devices, expanding functionality for low-signature operations or muzzle rise mitigation during precision shooting. As a regulated firearm, the M400 SDI requires proper federal licensing and compliance with all applicable state and local laws; prospective buyers should verify their jurisdiction's regulations regarding pistol-caliber rifles and short-barreled platforms before purchase.