What is the caliber of the m9 pistol barreta?

The Beretta M9 pistol is chambered for the 9x19mm Parabellum cartridge, commonly referred to as 9mm. This caliber is widely used by military and law enforcement agencies around the world due to its effective balance of stopping power and manageable recoil. The M9 has been the standard sidearm for the U.S. military since the 1980s.