CJD wrote:"no person shall be convicted of an offense under subsection (a) or (e) with respect to a Federal facility if such notice is not so posted at such facility, unless such person had actual notice of subsection (a) or (e), as the case may be."
Underlined part would worry me. You would know it's a federal facility, would you therefore have "actual notice?"
Also, "(d) Subsection (a) shall not apply to—
(3) the lawful carrying of firearms or other dangerous weapons in a Federal facility incident to hunting or other lawful purposes."
Could concealed carry not be a "lawful purpose?"
It would depend on whether "lawful purpose" includes what's lawful under state law, or only what's lawful under federal law. I'm guessing it's the latter.