Well, that is a problem. Walk it right up to the line and protest that the Law in DC is a false law.
And be prepared to deal with the consequences if that pseudo-law is pseudo-breached and pseudo-enforced against you, with no good long term results. It’s the Patton thing. I hate to lose. Giving the left a great youtube video to promote gun control while losing my freedom and maybe my life, with absolutely no prospect of converting that particular situation into a real win? Not interested. Put me in Benghazi violating a top-level order to stand down because if I obey that order, American lives will needlessly be lost? That is a fight worth winning, and a danger worthy to accept, as the reasonable price of freedom.