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The M9 is a standard 9mm round. the M9 is actually a .355 caliber
9mm
The common sidearm pistol issued to the US Army is the M17/M18 Modular Handgun System, which is based on the SIG Sauer P320 pistol. It is a 9mm caliber semi-automatic pistol that replaced the previous generation M9 Beretta pistol.
The sidearm of a US Marine is currently the M9 pistol. It is a semi-automatic handgun chambered in 9mm and has been in service since the mid-1980s. The Marine Corps is in the process of phasing out the M9 and transitioning to the M18 pistol, which is a more compact and modern version of the M9.
The M9 pistol is chambered in 9mm Parabellum (9x19mm) caliber.
9x19, also known as the 9mm Luger or 9mm Parabellum.
Condition 2, does not apply to the M9 Service Pistol.
One would not need to purchase an M9 pistol. One may want to purchase an M9 pistol so they can go target shooting with it. Target shooting is a hobby many enjoy.
9mm Parabellum
140mm
217 mm
125mm