Can you still be in Tac Ops with a ported (not compensated but holes are drilled in the top of the barrel about 3 inches back from the end) shotgun barrel?
^ What he said.
I used aluminum flashing with some high temp spray paint.
The clamp holds it in place, but with 1260 fps slugs, the pressure buldges out the cover. Had to wrap it around twice this time. http://youtu.be/PTv5R9WlIu4?t=1m45s