The opinion is here [pdf].
Justice Thomas issued the majority opinion, and it was a 6-3 decision along the expected partisan lines.
The dissent was written by Justice Sotomayor, who had this bit of insight:
Justice Thomas issued the majority opinion, and it was a 6-3 decision along the expected partisan lines.
This case asks whether a bump stock—an accessory for a semi-
automatic rifle that allows the shooter to rapidly reengage the trigger (and therefore achieve a high rate of fire)—converts the rifle into a machinegun.” We hold that it does not and therefore affirm.
The dissent was written by Justice Sotomayor, who had this bit of insight:
When I see a bird that walks like a duck, swims like a duck, and quacks like a duck, I call that bird a duck.