P90

The P90 is a non-canon submachine gun featured in some fanon maps.

Remember When...
Note: This weapon was cut from the final game.

The P90 was originally going to appear in the Remember When... storyline maps. It can still be accessed via console commands. It does not have a pack-a-punched variant, showing that it was cut early. Since it has similar stats to the M960, it was most likely replaced by M960.