Just bought a bizon from genuine German.
the factory earwax in the gearbox was slowing the rate of fire and the piston ring was dry so a quick clean, shim and grease and I now have a loaner gun/ super lightweight bb hose shooting 339fps.
this is a gun II would be happy to paint being a poly/sportline model, it is however a metal cyma style gearbox and strips down in nearly the same way as an lct pp19 vityaz
new hop rubber and gate pico fitted and the folding stock clip sorted now shoots .25 very nicely (the hicap struggles to feed anything heavier)
i honestly don’t know why the factory put that gloop in it, the irony is the most of it was on the anti rotation lever and there was sod all on areas that could have done with it