The Mk IV SOCOM was the latest Agent-purpose pistol released by MTI. With SemiSmart-nano input as standard, and star-shaped muzzle attachment, the Mk IV was highly sought after by people looking for high fire rate. The Mk V was exactly the same gun as the Mk IV, but used Notum alloys instead of standard alloys, which enabled additional nano-controlled properties. The Mk VI Proto is MTI's own try at making a version that benefits from this.