Well, realistically there's no such thing as "reasonable restriction"; maintaining arms parity with one's government for defense of liberty is a natural human right. This is a simple fact, and no human opinion from SCOTUS on down changes that reality.
Regarding the current US legal situation with regard to MGs, the NFA-type registration is easy enough for a good citizen to pass through; what needs to be eliminated is the '86 manufacture ban that puts MG prices absurdly out of reach of the average citizen.
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