The gun is a copy. Soumi was first, the Soviets copied it and adapted the PPSH to mass production. The PPSH has the same bolt, feed, magazine etc etc. Changing production methods and chambering didn't make the PPSH a new gun.
Blimey - the Finns themselves marvel at PPSh design, try to even adopt it for their own use, say it was not a copy... Out comes Sorrow and tells us otherwise
"Kurt Tank -the father or all modern aircraft" debates spring to mind. Same feed/magazine? There's just so many ways to feed rounds into an automatic weapon, they largely remained unchanged since before the WW2. Adopted for mass production my a***...
Sorry Brady, didn't mean to hijack your thread - I'll go away and be quiet now