Still, if you want to kill folks most efficiently the AR-15 beats the M1 by a mile. It is not power that is important. It is speed of discharge.
I currently own 3 guns. And sure owning and shooting an AR-15 type gun might be cool and fun, but I will gladly give up owning such a lethal weapon and get them out of circulation to save lives.
And that’s the trade off. To satisfy the whims of a few selfish folks many will have to die. Screw the NRA!