P90

The P90 is a compact sub-machine gun unlocked for at level 17.

Overview
Thanks to its high concealment, the P90 is a popular choice when stealthing a mission. The P90 is ideal for stealth classes, along with the G17 and P250. The P90's high fire rate and low damage makes it well suited for its SMG role and perfect for Close Quarters Combat. It does however somewhat have trouble conserving ammo, as it eats it up faster than it can be supplied, so you may want to bring an ammo bag or have the Fully Loaded skill.(Armed and Dangerous is also helpful.)

In long range engagements, the P90 has trouble landing shots on target because of its stability. So you may have to burst fire or fire in semi automatic when dealing with enemies from a distance.

Stealth Capabilities
The P90 is made for stealth. When in a stealth mission the P90 takes out guards quick and easy, which allows for clean kills. P90 allows for you to easily sneak around guards without being caught due to its ridiculously high concealment.

Summary
In summary, the P90 is the ideal weapon for stealth, and even performs well on loud heists in CQC. However, it has some trouble conserving ammo. Otherwise, the P90 is the perfect SMG to fit your stealth and CQC needs.

Trivia

 * The in-game model is based on the P90 TR variant because of the triple rail system.
 * The full name of the P90 is the FN Project 90 PDWS and was developed by Belgian gun manufacturer, FN Herstal whom also developed the FiveSeven trademarked as the FN Five-seven.