The Beretta M9, is a 9×19mm Parabellum pistol of the United States military adopted in 1985. It is essentially a military specification Beretta 92F, later the 92FS. The M9 won a competition in the 1980s to replace the M1911A1 as the primary handgun of the U.S. military, beating many other contenders. It officially entered service in 1990. Some other models have been adopted to a lesser extent.