Here is part of Sec. 930
(d) Subsection (a) shall not apply to - (1) the lawful performance of official duties by an officer, agent, or employee of the United States, a State, or a political subdivision thereof, who is authorized by law to engage in or supervise the prevention, detection, investigation, or prosecution of any violation of law; (2) the possession of a firearm or other dangerous weapon by a Federal official or a member of the Armed Forces if such possession is authorized by law; or (3) the lawful carrying of firearms or other dangerous weapons in a Federal facility incident to hunting or other lawful purposes.
Now after reading number three it sounds like you can have a firearm in federal facility if it is "incident" to hunting. So does that mean I can have a shotgun in my vehicle in a federal facility and say its for hunting after/before work?
Where I work, which is a federal facility, we have a parking garage for the first few floors of our building. So when I park there it is a federal facility. I have the option to park about half a block away in another parking garage owned by the county.
So are my options A) Have a shotgun in my vehicle and park in either lot? or B) Have a handgun that I carry and leave it in my car parked at the county garage? or C) Can't "legally" do either one?