Well, a semi-auto M60 is available, with nothing more required than a gullible customer, a fat bank account, and a phone call to Warshington...
A full-auto needs a fatter bank account, six months, and sign-offs... I've never heard of age restrictions on NFA - are there?
Oh, and you'll need to send it to one of the specialists and have it reworked for reliability, if it hasn't already.