Although the prototype of the KRISS series was designed by the Swiss, its patented bolt technology was originally designed and named by French engineer Renaud Kerbrat (English translation: Renaud Kerbrat) for Kriss Super V (KSV). This is a delayed-recoil bolt with an articulated mechanical structure. There is a counter-balancing mass behind the bolt to transfer recoil and delay the recoil of the bolt. When the bullet is fired, the cartridge case pushes the main body of the bolt backward under the recoil of the high-pressure gas. After the bolt is unlocked, it must first overcome a slope on the balance weight that delays the unlocking, and then begins to move backward horizontally. movement, and through an inclined surface of the balance weight block, forcing the balance weight block to move downward under the guidance of the recoil spring guide rod, so that the recoil spring is pressed into the guide groove behind the magazine slot that can accommodate the bolt. ; At this time, because the locking lug (English: Lug) of the bolt is stuck in the guide groove of the balance weight, when the bolt moves horizontally for a certain distance, it is driven by the balance weight and leaves the central axis and moves toward deflection down. After the recoil spring is fully compressed, recoil will begin. The recoil spring begins to rebound the balance weight and move upward. Under the action of the same slope, the bolt moves upward and forward. After returning to the central axis, it pushes the next bullet in the magazine to be loaded and continues forward. Until the end face of the bolt and the rear end of the barrel chamber are connected in a line, they are closed to form a lock. The KRISS series is not the first firearm to use this type of bolt operation.
The manufacturer claims that the purpose of using .45ACP, which has the largest stopping power and recoil among pistol bullets, is to prove that its bolt machine can "control" this powerful ammunition. After internal testing, the recoil felt by the HK MP5 submachine gun firing 9x19mm caliber pistol bullets increased by approximately 90%; while the recoil felt by the KRISS Vector series firing .45 ACP caliber bullets only increased by approximately 60%. Other calibers in the TDI Vector family, such as .40Samp;W and 9mm Luger, are currently in development. All KRISS series submachine guns will use the detachable magazine of the standard Glock pistol to feed ammunition. For example, the .45ACP caliber weapon uses the 13-round Glock 21 detachable magazine, and 28 and 30-round detachable magazines were developed based on it. Special magazine.
The KRISS series has many obvious ergonomic advantages, including: not only does the barrel of the gun, like the M16 rifle and the German FG 42 rifle, buttstock and chamber are connected in a straight line to fit the shooter's shoulder, And while being in line with the pistol grip (like many target guns), there is also a fixed design vertical foregrip installed close to the barrel to help improve its accuracy and stability. In short, using the bolt action system of the Super V mechanism can greatly eliminate the recoil and muzzle rise that users claim to feel between the distance between the user's hand, the axis of the barrel, and the shoulder against the butt. (especially when firing on full auto), and reduces user fatigue.