An M4A3 Service Pistol, once the standard issue sidearm of the Colonial Marines but has recently been replaced with the 88 Mod 4 combat pistol. While it is reliable in the arms of a crewmember, it is best used as a fall-back weapon in case one doesn't have any more ammo. Fires 9mm pistol rounds. This is one of the three handguns that the marines have stocked in their combat prep vendors. All Cargo Technicians start with one.