The Model 2511 Pistol was a handgun that was designed in the year 2511. It was a very stable and robust design that was simple to use, as well as simple and cheap to make. The UNSC did not adopt the weapon, instead choosing the newer M6 for the better and bigger round. As a result, the M2511 were not an official armament of the UNSC during the Human-Covenant War, although Marines and Special Ops team were occasionally glimpsed to be toting one.