Well. His whole issue was little more than “don’t legalize machineguns”.
Please, oh please, eliminate 922(o)...
What needs to happen is that SCOTUS' ruling destroys the 'Sporting Purpose' language in the 1968 GCA. If the ruling goes our way, that one will be the first to fall. There is no way 'Sporting Purposes' can be defended by the Federal government if SCOTUS rules we have an individual right to keep and bear arms both separate and in concert with the militia.
Congress would have to amend the US Constitution to remove the Militia Clause to head us off at the pass.