Pederson Semi-Auto Device
Think the Govt. destroyed all of the Pederson devices save a few in collector's hands. The cartridge was reportedly terribly under powered form all accounts.
Like the previous poster said, forget the full auto stuff, the Feds now use tanks and helicopters and snipers against their image of lawbreakers.
Take a look at John Browning's "potato digger" machine gun and definitly consider a proper disconnector.sear arrangement to render it "semi"...........