The National Firearms act can be found HERE:http://en.wikipedia.org/wiki/National_Firearms_Act
And the reason for the warning:
I saw the YouTube video of the guy in FINLAND who taped a plastic soda bottle on the muzzle of a rifle.
In FINLAND suppressors are not controlled.
WARNING!!!!!You gotta have BATF permission to put anything on the muzzle to reduce the sound.
DO NOT tape a pop bottle on your rifle.
March 27, 2008 8:41 AM