These people are morons. Republicans and democrats alike. How do you register a magazine with no serial numbers? I mean how damn stupid can you be. Not one item takes the guns out of the hands of criminals. The attacks on law abiding citizens freedom continues unabated. It will never end and America will end up a nation of slaves unless America eventually splits into two nations, one for freedom lovers, one for slaves.
"You" (i.e. the state) provide a tag with a number. Probably adhesive coated metal foil. Add a penalty for removal of tag. Not rocket science.