PPSh-41, Soviet's first mass production weapon – LAI Publications
S&T PPSh-41 WWII Electric Blowback Airsoft AEG Submachine Gun (with Drum)
S&T PPSH-41 WWII EBB w/ Drum Mag | JD Airsoft Ltd
PPSH-41 with an experimental "sideways" drum mag. Apparently these were tested in late 1941/early 1942 for more convenient storage and handling. : r/ForgottenWeapons