KRISS USA KV90PFD20 Vector SDP 9mm 5.5" 41-Round Threaded Barrel

The KRISS USA KV90PFD20 Vector SDP 9mm 5.5" Threaded Barrel is a purpose-built submachine gun platform engineered for law enforcement tactical teams, military special operations units, and professional armed security personnel. The Vector SDP designation identifies this as the Short Defensive Pistol variant—a compact, high-capacity alternative to traditional patrol carbines. Designed for close-quarters battle (CQB), vehicle operations, and entry teams, this 9mm platform delivers controllable firepower in tight spaces where full-length rifles prove unwieldy.

The KV90PFD20 leverages KRISS's proprietary Super V recoil mitigation system, which channels muzzle energy downward and rearward through a dual-spring hydraulic mechanism, resulting in dramatically reduced muzzle climb and felt recoil compared to conventional blowback or direct impingement designs. The 5.5-inch threaded barrel supports suppressor mounting, allowing operators to reduce signature and hearing signature during tactical operations without sacrificing ballistic performance in the subsonic and supersonic envelope. The 41-round magazine capacity provides substantial firepower density, minimizing reload frequency during high-stress engagements while maintaining a controllable overall length of 31.5 inches and combat-effective weight of 11.02 pounds fully loaded.

Operators benefit from the Vector SDP's modularity, ergonomic controls mirrored to AR platform conventions, and proven reliability in duty environments. The threaded barrel configuration allows seamless integration with sound suppressors, compensators, and flash hiders to match mission requirements and weapon-mounted light systems. This platform is ideal for agencies transitioning from pistol-caliber carbines to a truly dedicated CQB system, or for armed professionals requiring a 9mm solution that delivers rifle-level controllability in a compact form factor. Compatibility with standard Glock-pattern 9mm magazines ensures logistics simplicity and widespread ammunition availability across jurisdictions.