Yes, the 2nd Amendment even applies to Federal grounds.
Anthony Bosworth was apparently on federal property outside a government building. He had attended a states rights’ rally in Spokane, Washington, and he was carrying his rifle slung around his shoulder.
He was approached by half a dozen federal agents, some from Homeland Security, who informed him that he was in violation of federal law, since he was on federal grounds with a firearm. According to one of the officers, the exact law that he was in violation of was 18 U.S. § 930. Here’s video of the encounter:
So, what does 18 U.S. § 930 say? You can read the entire thing here. Here’s subsection (a):
(a) Except as provided in subsection (d), whoever knowingly possesses or causes to be present a firearm or other dangerous weapon in a Federal facility (other than a Federal court facility), or attempts to do so, shall be fined under this title or imprisoned not more than 1 year, or both.
In short, it prohibits civilians from carrying firearms in a federal building. It doesn’t say anything about carrying firearms on federal property. Think I’m splitting hairs? Well, this is legalese. If they wanted to make it clear that guns were prohibited on federal grounds and not just federal buildings, they should have said so. There is a distinction.
In addition, there’s even an exception to the rule, referenced in subsection (a):
(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.
So, if anything, this man was in direct compliance with U.S. Code, even if he were to enter the federal building with his rifle. It could easily be argued that his carrying his rifle inside the federal building constituted “other lawful purposes” referenced in the exception above.
But he didn’t go inside the building. This wasn’t a stunt. He went to a states rights’ rally carrying his gun. Nothing illegal. If it were illegal, they would have charged him something. But they arrested him and then released him with no charges.