The discrepancy could be a result of different terms used to describe ghost guns. For example, Polymer80s which are made with kits online and other hobbyist guns without serial numbers could be ...

Call of Duty: Ghosts features an all-new game mode by the ... We will certainly recommend you to level up to 22 so that you unlock Sentry Gun, which serves as another player.

For example, Polymer80s which are made with kits online and other hobbyist guns without serial numbers could be classified as PMFs while other cities may call them ghost guns or unserialized weapons.