The M9 Beretta pistol is the standard Marine Corps sidearm. It replaced the M1911A1 pistol in .45 caliber. 

The M9 is a light weight, semiautomatic pistol manufactured by Beretta with has redundant automatic safety features to help prevent unintentional discharges. It can be fired in either double or single action mode and can be unloaded without activating the trigger while the safety is in the "on" position. The M9 pistol has a 15-round magazine, and may be fired without a magazine inserted. This weapon can have the hammer lowered from the cocked, "ready to fire," position to the uncocked position without activating the trigger by placing the thumb safety on the "on" position.

Primary function: Semiautomatic pistol
Builder: Beretta and Beretta USA
Length: 8.54 inches (21.69 centimeters)
Width: 1.50 inches (3.81 centimeters)
Height: 5.51 inches (14 centimeters)
Barrel length: 4.92 inches (12.5 centimeters)
Weight fully loaded: 2.55 pounds (1.16 kilograms)
Bore diameter: 9mm (approximately .355 inches)
Maximum effective range: 152.5 feet (50 meters)
Magazine capacity: 15 rounds
Muzzle velocity: 1200 feet (365 meters) per second