History

The PP-90M1 (Cyrillic: ПП-90М1) is a 9x19mm Parabellum Russian submachine gun developed by KBP Instrument Design Bureau in the 1990s. It features a 64-round helical magazine, and other than sharing a manufacturer is unrelated to the similarly named PP-90M.
 
The weapon may also be used with a 32-round box magazine if desired.
 

 
The PP-90M1 is designed to fire 9x19mm 7N31 rounds. The round is overpressure armor-piercing ammunition, and when fired from the PP-90M1 can penetrate 10 mm thick steel plate at a range of 10 m.

Singleplayer/Spec-Ops

The weapon first appears in the level Hunter Killer, where it can be found with or without a Red Dot Sight. It can also be found with a silencer.

Multiplayer

the PP90M1 is available from start in the Grenadier Pre-Made class and unlocked at Level 28. It doesn't have high recoil, but rather a somewhat obstructive muzzle flash.

The PP90M1 is a very versatile submachine gun, ideal for short to medium range combat. There are a variety of useful attachments for the PP90M1. Silencer is a good choice since it eliminates muzzle flash, making it easier to stay on target (especially at medium range), where damage drop off is not an issue because of its very high fire rate and low recoil. Red Dot is another good choice since it is gives a clearer view on target and the muzzle flash is not as obstructive. Extended Magazines or Rapid Fire make for good attachments, especially when coupled together. The increased magazine size will compensate for the high fire rate. This combo allows enemies to be quickly dispatched at close range, without fear of depleting the magazine.

Attachments

Attachments	Challenges	Icon
Reflex Sight	Get 60 kills while looking through a Red Dot Sight attached to a SMG.
Silencer	Get 60 kills with a Silencer attached to a SMG.
Rapid Fire	Get 30 kills with Rapid Fire attached to a SMG.
ACOG Scope	Get 20 kills while looking through a ACOG Scope attached to a SMG.
HAMR	Get 40 kills with a HAMR Scope attached to a SMG.
Holographic Sight	Get 20 kills while looking through a Holographic Sight attached to a SMG.
Extended Mags	Get 40 kills with Extended Mags attached to a SMG.
Thermal	Get 40 kills while looking through a Thermal attached to a SMG.

Proficiencies

Proficiency	Description	Icon
Kick	Kick Reduces recoil by 20%, allowing for steadier full-auto and faster recovery from shots.
Range	Offers a 25% boosted effective range. This is very useful on Shotguns, particularly the automatic variants. Some SMGs can benefit from this upgrade, as well, especially if you are intent on using medium-range optics.
Attachment	Allows the use of 2 Attachments. It is a solid all-around Proficiency, useful in many situations. This Proficiency is also notably useful for stealth builds, as it allows you to use a Silencer alongside any other Attachment. The Attachment Proficiency is also helpful if you are still getting comfortable with iron sights, as it allows you to take and optical Attachment and a second utility Attachment.
Focus	Reduces visual recoil by 50% when you are hit. Focus is very effective for SMGs and Shotguns. It is also helpful for ARs, as it can keep your shots on target when you enter a heads-up one-on-one firefight.
Melee	Grants 35% faster melee recovery. Melee can be useful if you are stalking targets with a stealth Shotgun build. With the Riot Shield, it allows you to take down targets much more quickly at close range
Stability	Reduces idle sway by 25%. Consider this to be an 'automatic' Breath for long-range combat. It is most useful on LMGs, as they need the enhanced accuracy for long-range shots, though ARs also benefit from it.

Challenges