You are ignorant. Full auto is not illegal federally (may be illegal in some states). If you can find one on the market (has to have been in the NFA market since before 1986), with a little paperwork and a lot of money, you can legally buy and own and shoot a full auto weapon. The hardest part is finding an affordable one on the market. Next, you have to go through fingerprinting, and pay a $200 transfer tax.