It's important to never try holding an overly powerful potato gun. They should be self-supported like a howitzer. One should also never even think about building a suppressor for a potato gun. If my memory is correct the penalty for posessing a suppressor or the means of attaching one in the United States without the proper license is 10+ years in jail.
"If one has realized a truth, that truth is valueless so long as there is lacking the indomitable will to turn this realization into action!"
-A.H.