the suomi barrel is way way bigger than the pps, you might look into the kp44, its basically a pps that uses suomi drums and sticks. the suomi doesnt have a trunion per say, the barrel goes right onto the milled receiver and has big notches in the back of the barrel. it slides on and turns about 90 degrees untill it locks up
I'd rather be right than politically correct.
looking for PU scopes #b07850, A89721 and PEM #b27948, i have its rifle,
check out the pics of my GECO 1929 tula sniper, 1895 winchester russian contract rifle in 762x54, Remington mosin cadet trainer with 03 lug, New England Westinghouse cadet rifle with US property stamps, 1927 izhvesk dragoon , 1929 izhvesk dragoon, instructie 91/30 rifle, m24 lotta , triple scope number pu sniper and others in my albums