The KRISS Vector is a series of weapons based upon the parent submachine gun design developed by the American company KRISS USA, formerly Transformational Defense Industries (TDI). Designed in 2006 and seeing limited production since 2009, the KRISS Vector uses an unconventional delayed blowback system combined with in-line design to reduce perceived recoil and muzzle climb, invented by French engineer Renaud Kerbrat. The weapon is designed to accept extended Glock magazines and fires a variety of pistol cartridges. It is produced in 9×19 mm, .40 S&W and .45 ACP.