Nope. They are covered under the National Firearms Act (NFA). Suppressors (or incorrectly “Silencers”), machineguns, short barreled rifles, short barreled shotguns, destructive devices, etc. are all legal to own on a federal level as long as you pay for a special tax stamp and jump through a few hoops. Over half the states in the nation have no additional requirements. Some states require registration. Some states add restrictions that make these items very difficult to obtain.