The .40 caliber introduced at the 1990 S.H.O.T. Show closes the gap between the heavy .45 charges and the internationally proven 9 x 19mm service calibers. GLOCK was the first manufacturer to make the advantages of this balanced caliber accessible to law enforcement agencies in a perfect pistol. Today, countless police units in the United States and throughout the world put their trust in the 15-round GLOCK 22.