There would be a stampede to buy guns (re: Obama sold the most guns of any president) There would be a linked increase in the sales of Shovels, and large bore PCV Pipe.
Prices would Sky-Rocket.
Gun Publications would increase, with the HSA, FBI, USPS, ATFB-E, and other agencies taking names & addresses for use during the final Gun Grab.
I would expect the Government to Publish (secretly) its own Gun Magazines to garner Mailing Lists for the Gun Grab.
Any Limitation on Gun Purchase/Ownership, Licensing/Permits can only end with confiscation. There is no other reason to "be infringed".
Important business and government have their own hired bodyguards.