The rimless, tapered 9x19mm Parabellum was created by Austrian firearm designer Georg Luger in 1901 — four years before John Moses Browning dropped the .45 ACP. Like the .45, the 9mm was designed for ...

The military eventually turned to the Colt M1911 design and its .45 ACP round, both of which were designed by John Moses Browning. The .45 ACP went on to become the standard issue American ...

45 Automatic Colt Pistol round, or .45 ACP as it is commonly known, is fairly controversial. Invented in 1905 by prolific firearms designer John Moses Browning, the .45 ACP was the standard ...

45 ACP, in mind. The .45 Automatic Colt Pistol round, also designed by John Browning, was developed in response to the ineffectiveness of the U.S. Army’s then sidearm, the Colt M1892 revolver.