The KRISS Vector uses the KRISS Super V Recoil Mitigation System, that is an articulated mechanism which allows the bolt and an inertia block to move downward into a recess behind the magazine well. The theory is that at the end of this travel, the energy is transmitted downward rather than rearward, thus reducing the felt recoil. When fired, the barrel axis is in line with the shoulder as in the M16 rifle, but also in line with the shooter’s hand. This is intended to reduce muzzle climb when combined with the off-axis bolt travel, though it also greatly raise the sight line in comparison to the bore axis. The initial prototype model by TDI achieved a rate of fire of 1,500 rounds per minute (RPM), though this was bought down to around 1,200 rounds per minute (RPM) on the production models.