I have seen a few people asking on how to remove the shroud on the Vulcan so here i am going to show you with pictures.
This is how the shroud should look when it is secure to the rifle
After you unscrew the shroud it will look like this
Then you just wiggle it back and forth a little and it will pull off. These are the threads near the muzzle the shroud screws into
When you pull it off you are going to feel a little bit of resistance because of the O-ring in the back side of the shroud
That is how you remove the shroud on the Vulcan i hope this helps if you have any questions don't hesitate to ask.
Leo
This is how the shroud should look when it is secure to the rifle

After you unscrew the shroud it will look like this

Then you just wiggle it back and forth a little and it will pull off. These are the threads near the muzzle the shroud screws into

When you pull it off you are going to feel a little bit of resistance because of the O-ring in the back side of the shroud

That is how you remove the shroud on the Vulcan i hope this helps if you have any questions don't hesitate to ask.
Leo