How Russian SMG PP-2000 works?

You may find this model in the program World of Guns:
Download links:
Steam: http://store.steampowered.com/app/262410/
Mac AppStore: https://itunes.apple.com/us/app/world-of-guns/id1143779751?ls=1&mt=12
Google Play: https://play.google.com/store/apps/details?id=com.nobleempire.wog
Amazon: https://www.amazon.com/gp/mas/dl/android?p=com.nobleempire.wog
App Store: https://itunes.apple.com/us/app/world-of-guns/id1033160159?mt=8

Видео How Russian SMG PP-2000 works? канала NobleEmpire