The MP40 is one the best SMG in the COD warzone. I use this gun myself and pair it with the GRAU. Popular streamers have been of high praise on the gun and with the right attachments and perks you can make it even more powerful.
Muzzle: Recoil Booster
Barrel: Krausnick 317mm 04B
Optic: Krausnick ISO 2M
Stock: Krausnick 33M Folding
Underbarrel:M1941 Hand Stop
MAGAZINE: 7.62 Gorenko 45 Round
Ammunition: Hollow Point
Rear Grip: Polymer Grip
Perk: Brace
Perk 2: Quick
The Recoil booster helps to increase the fire rate while the Krausnick 317mm 04B barrel and M1941 Hand Stop will improve the range and accuracy. The Polymer Grip would help with the recoil control and keep it at a good level to allow the gun to have better accuracy. The Krausnick 33M Folding stock gives a boost to your mobility when using the gun.
The 7.62 Gorenko 45 Round Mags was picked to allow plenty of bullets to take out enemies and the Hollow Point ammo gives out more limb damage. #
I also picked the Krausnick ISO 1M because of its added ADS speed.
Best MP40 Perks
Perk 1: Double Time
Perk 2: Overkill
Perk 3: Combat Scout
Primary (Overkill): Bren
Lethal: Throwing Knife
Tactical: Stim
For perks, we recommend running Double Time, Overkill, and Amped – it’s a tried and tested trio that is still effective as we enter the Warzone Pacific era. Double Time will help you get around the map quicker and Combat Scout will help you track moving targets that you damage so your teammate can finish them off.
Overkill will let you carry another primary weapon, and we all know the MP40 doesn’t do well in long range so this is a good perk to have as it allows you to carry a more lethal long range weapon.
Finally, the throwing knife and stim are good options in warzone as it can provide you a slight edge in fights if used well.