The need for a fully automatic high powered assault rifle seems pretty extreme for hunting or to defend yourself. These seem to be the weapon of choice for people committing these mass shootings worldwide.
Fully automatic weapons require a federal tax stamp and cost about $30,000 and have to have been made before 1984, can you tell me the last time someone used a legally registered machine gun in a crime in America?
This kid used a stolen shotgun and .38 revolver.