Find a toilet paper roll and cut it, then tightly wrap it around the existing muzzle break and then add tape around the whole roll
Step 2: Detail
Then take it off and cover the whole thing in masking tape to give it a smooth surface, then cut out holes in the end for looks (any hole size or shape you want) then Smoot out the inside.
Step 3: Finish
I have not finished but, spray paint it (Any color) and glue it on top of the existing muzzle break....and enjoy.....(you could also paper mâché it before spray painting to make it even more solid)..... Please comment