Well, I also have an "extension" that is made to allow you to use a 600mm liner in a VP 500mm barreled Crown. So all I really need is the 600mm shroud?
What you're suggesting is moving part number B6 (19926 Shroudstop Crown) towards the muzzle enough to fit? I'll have to give that a try and see how it works. I just want it functional enough to do some testing.
thanks,