Fat chance. Simple ownership of a class of weapon that is legal is not probable cause unless it is coupled with additional evidence. And denying agents the ability to search is also not probable cause.
You don't know judges then, in DC/Maryland in the middle of this spree, you are indeed in denial if you think they could not find a judge to sign the form if they wanted. Judges are just people, and they come in all bents, and you think there isn't one sitting that would have signed it? I guarantee if they wanted to, they would have gotten one.