Beretta M9

The Beretta M9—officially the Pistol, Semiautomatic, 9mm, M9—is the designation for the Beretta 92F semi-automatic pistol used by the United States Armed Forces. The M9 was adopted by the United States military as their service pistol in 1985.

The M9 won a competition in the 1980s to replace the M1911A1 as the primary sidearm of the U.S. military, beating many other contenders, and only narrowly defeating the SIG Sauer P226 for cost reasons.[1] It officially entered service in 1990.[2] Some other pistols have been adopted to a lesser extent, namely the M11 pistol, and other models remain in use in certain niches.