Interesting situation here with plenum.
After putting everything back on the gun and double checking I screw the bottle. It took almost two seconds to fill big plenum and everything look fine. Then I tried to put barrel in and it would not get into rear block. It was misaligned for about 0,5mm maybe little less. I then took bottle off a gun, depressurized the gun, plenum also and everything was fine. The barrel was moving in and out of the rear block easy like it should. It is easy to align the barrel of a plenum with front and rear part, valve housing freely spins and front part can be screwed just enough to be flush with the body of plenum and in line with the front main block of a gun. Now with the barrel in the gun and with the pressure in the system I can hardly take out the barrel, even to rotate it is hard.
So to summarize, without pressure in the gun everything is perfect, with pressure the barrel is almost locked, hard or no spin, no taking out without big force. I know about the notch in barrel inlet off course, i can hardly pull straight 3mm barrel out past it.