If you take the shroud end cap and shorten it to only 4 remaining threads then shorten and crown the barrel to only 5 remaining threads you can fit in a 1" air stripper to make the shroud functioning. Drill (3) 1/16" vent holes at the rear of the shroud (Make sure it clears the breach threads) and cut a small foam ring to fit over the barrel and inside the shroud. Slide it to the breach over the barrel and it baffles the air exiting the vent holes. Here is the before and after. You can also shorten the dust cover and install the barrel band from the Puncher Breaker or Mega to help with any POI shift. 
