The Knight's Armament Company 6×35mm PDW is an experimental personal defense weapon designed by Knight's Armament Company (KAC), firing a 6mm cartridge optimized for short barrel weapons.

[citation needed] However, the cartridge, upper receiver, and operating mechanism are all new designs by KAC.

[3] The KAC PDW fires a 6×35 mm cartridge, which is over a centimeter shorter than the 5.56×45mm NATO round.

[1] Fired from a 10-inch (250 mm) barrel, KAC claims that the 6×35mm cartridge reaches a muzzle velocity of 2,450 ft/s (750 m/s), slightly faster than the muzzle velocity of a 5.56 mm cartridge fired from a similarly short barrel.

[citation needed] The weapon was formally introduced at the 2006 NDIA Small Arms Symposium in Albuquerque, New Mexico.