As far as I have read (in russian sources) there were entire companies equipped with Papashas, especially in mechanized divisions (the famous tank riders). I you look at pictures of the Bagration time, end of war, there are a lot of Papashas in them...
Semiautos were exceptional in Soviet Army due to high cost, high requirements for its maintenance and the discipline needed to not spend too much ammo, so only elite units as Marine Infantry or Black Sea Fleet deployed it massively...