Firing a parabellum .40 caliber round, the MP5 is capable of single shot, three round burst, or fully automatic fire at 800 rounds per minute. The MP5 has a unique roller delayed blowback system which operates the weapon in a fully locked breach position. The MP5 uses a series of locks and cams to seal off the chamber, this means that the first round is fired from a locked chamber, giving the weapon greater accuracy on the first shot. This weapon is used mostly for CQB situations.