|The following is based on Fallout: New Vegas cut content and has not been confirmed by canon sources.|
The specifics of the GP machine gun are unknown. The weapon was at least planned at some point during development, but never made it into the final release of the game. The only remaining resource tied to the weapon is a single, unused, empty Form List, RepairNVGPMachineGun.
The GP machine gun was not included in the final release of Fallout: New Vegas.
Behind the scenesEdit
The "GP" in the weapon's name likely stands for "general purpose", referring to the general-purpose machine gun weapon classification used by many military services.