Here is an interview of Justice Scalia by Mike Wallace in 2012
WALLACE: What about… a weapon that can fire a hundred shots in a minute?
SCALIA: We’ll see. Obviously the Amendment does not apply to arms that cannot be hand-carried — it’s to keep and “bear,” so it doesn’t apply to cannons — but I suppose here are hand-held rocket launchers that can bring down airplanes, that will have to be decided.
WALLACE: How do you decide that if you’re a textualist?
SCALIA: Very carefully.
Scalia had it wrong. “Bear” did not mean “hold in your hands and carry”. “Bearing” an arm means to be able to have it with you at all times, to use it. Period. Just because Scalia got a lot of things right, doesn’t mean he got everything right.