In real life, the KRISS was named as the world's best weapon for close quarters combat by the Military Channel. It is a lightweight sub machine gun that uses a .45 caliber APC rounds with an amazing firing rate of more than 1000 bullets per minute with very little recoil. The KRISS' unique operating mechanism is designed to provide stability by absorbing recoil when firing. Combat Arms offers a standard KRISS as well as a modified special ops version.