Nation wide firearm confiscation by force is not possible.  Most of the local law enforcement patriots will not participate in an act of war against our country.  Yes, act of WAR.  I am well connected to my regional LOE community and believe they would refuse.  It would need to be through laws and policies for it to happen - VOTE REPUBLICAN.  It may be possible in dem controlled regions with compliant sheep (NYC, Baltimore, LA, SF...) but not in most of America.