I would be willing to guess that most state and local cops throughout the U.S. would never start going door to door to confiscate firearms.
I've taken a few tactical firearms courses taught by SWAT officers (both in their late 30's or early 40's). I have zero concerns about them, as regards a house to house gun grab. Now as far as a new LEO, about 23, and a year or two out of the academy...that makes me want to bury a rifle or two.
"I carry a gun because it is my responsibility alone - not that of the police, nor the government, nor the community - to defend the precious lives that God has entrusted to me."
Will Dougan, writing in gomemphis.com