TDI Vector

The TDI Vector is a prototype .45 ACP submachine gun developed by Transformational Defense Industries. It utilizes asymetrical recoil and in-line design to reduce recoil and muzzle climb. This operating system is called the Kriss Super V. "Kriss" refers to a Southeast Asian fighting dagger.

Design
TDI refers to the operating system as the Kriss Super V. The system claims to compensate for recoil by utilizing moving parts that travel down into a recess behind the magazine. This means they travel vertically and forces encountered when they reach the end of their travel act downward, reducing muzzle rise. The barrel is also in-line with the shooter's shoulder as in the M16 rifle and German FG42 but also in line with the shooter's hand. Combined, these factors are advertised to create less felt-recoil and muzzle climb. The Vector has the highest sightline in comparrison to the bore axis of any personal firearm. This results in significant vertical stringing with changes in range.

Variants
TDI announced that they will be producing a semi-automatic version of the Kriss for sale in the United States starting in the first quarter of 2008. TDI's new semi-automatic carbine is called the CRB/SO, with no confirmation on what the letters 'CRB' stand for although it is assumed they mean 'carbine'. The 'SO' is said to stand for 'special operations'. TDI has announced that it also plans on adapting the system for higher-power cartridges in the future.