Muzzle from WC22 fitted to IM22 barrel
Shroud adapter secured 6.5 inches from muzzle end to clear valve adjustment knob
Shroud cap
It is quieter and best full mag group of 9.6mm shot to date with it on at 25m. No more flyers, not yet anyways. No more of a few other issues as well, so far.
Happy with this setup, my Impact is finally shooting as it should Next is to get the parts machined. Then explore the Huggett option.