Denver will follow fast. There is the mindset that they want the most strict gun laws, and won’t let other cities ‘undercut them’. That is why they went to 15 rounds, no grandfathering, when the state went to 15. The 20 round limit in place then was functionally more strict than the state, since there was no effective grandfathering.

SCOTUS really needs to clarify this thing NOW. The 5 need to leave Roberts on the other side and actually get impactful rulings. Gun law rights has been a very slow and tedious movement. Gay Marriage was decided in one case after they found the Gay Marriage was actually mentioned in the 75th Amendment.