This is meant to be used with >:3's standalone PPSh-41 mod, you can find it here.

Note: This will replace the M45 (Swedish K) unsuppressed firing sounds as a side effect. This is because the PPSh is based off of the M45 and we are not yet able to add custom soundbanks (to be honest who the hell uses the Swedish K outside of stealth anyway).

"This doesn't sound right/It sounds slower than it should!"
This is because you are used to World at War's PPSh firing speed. >:3's PPSh (and most others) fire at 900 RPM, the one in World at War fires at 1250 RPM.