Although not a resident, I do have family living in Denver and avoiding the area is not an option.
Back to the point:
I have read, in relation to the old "Denver assault weapon ban", of confiscations of 30 rounds magazines inside Denver County from non-Denver Co residents.
SUPPOSEDLY, the firearms were also confiscated, falling under the OLD assault weapon definition (a firearm with magazines that accepted more than 20 rounds), and the vehicle seized.
Although not being a resident was indeed to be considered affirmative defense against the charges, the owner had to surrender the weapon in order to get the case dropped, the vehicle returned and avoid a costly legal battle.
How much of this is true, remains to be seen, but it did give me pause.
If somebody has better information I would love to hear more about it, maybe someone with a better Google-Fu than myself could help?