The IRS is in the executive branch. Trump's hiring the new head of the agency. He can go in and either start firing people or have people reassigned. They can go office by office or pink slip en masse. I don't care which. But they will do as they're told or be fired. The President of the United States should not be worried about a bunch of data weenies who happen to carry pistols.
No offense but you are missing a lot of the point. It is much more complicated than that. Not worrying about carrying pistols. Worrying about graft and corruption along with sabotage going out once they are made aware. So many things are in place not to steal, kill, and destroy. You have to be fully organized first before execution. And to note, the IRS is not in the executive branch, that is the Department of the Treasury. The IRS is under the Treasury department along with the Bureau of Engraving, the U. S. Mint, and others but those come to mind... Much more complex than just going in and cleaning house. The areas are intertwined.
I am looking forward to watching the fray, seriously. Some will be hurt financially but in many cases it is self-inflicted already.