Staff Writer (Updated: 8/22/2014):
Submachine guns have long held a distinct existence on the battlefield as well as in service with security and police forces worldwide. They came into their own during the close-quarters battles of World War 2, being fielded by all sides in several noteworthy examples to include the British Sten, the German MP40, the American "Tommy Gun" and the Soviet PPSh-41. Submachine guns helped to fill the void between service rifle and squad support machine guns by providing for machine gun-like repeating firepower within a compact pistol-like form. Since their large-scale introduction and subsequent use in combat, the concepts behind submachine guns had remained largely unchanged with a few minor exceptions.
What makes the Vector unique in the world of small arms is its use of the KRISS Super V System (KSVS) recoil absorption system. The firearm is designed utilizing an "in-line" approach in which the major internal working components and firing function follow an imaginary line from barrel to stock. The idea behind the approach is the centralizing of physical forces to work in conjunction with the operator's grip to help reduce inherent recoil and muzzle climb - two detrimental factors to the accuracy of any firearm. The design approach reportedly results in greatly increased accuracy, recoil reduction (by as much as 60%) and nearly no muzzle climb whatsoever even when the weapon is fired on full-automatic.