i have just finnished the silencer on the walther carbon shroud. with the shoud being a solid. there is plenty of space for the air to expand inside the tube.
my first step was to see where the pellet left the shroud. i put some tape across the opening and shot a pellet. to my serprize it was pretty center. i then placed a washer over opening and tapped it up and removed the tape that covered the hole. i then took a shot and "wow it cut the sound bown by 70%" the biggest noise is the trigger.
i will be testing the accurassy tomorrow, i will let you know what happens.
here are 2 pics so far.