The P90 is a submachine gun that appears in Spec Ops: The Line.
The gun makes its first appearance in Chapter 10, Part 1, being used by the 4 Zulu Squad troopers in battle. The only way to use the P90 in singleplayer is to pick it up from a dead soldier.
It possesses a laser sight that can vastly improve its accuracy at long range.
It is unlocked at level 13. It does not retain the laser sight from Single Player.