Just remember why this proposed ban is likely going to happen. It is the goal of those in power in this country to disarm the people to make way for their nefarious ends. Follow the means, dispel the rhetoric they use, and there is only one end that all this points to.
Agencies like the ATF were created out of thin air(unconstitutional means) in order to have that afore mentioned goal easier to achieve. The rule making power invented for these agencies and the lack of any effective means to hold these agencies in check by Congress is designed purposefully to take the measures necessary to accomplish those nefarious goals out of the hands of our representatives that can be held accountable by the votes of We the People. We have unelected, untouchable government agencies with impunity doing the dirty work of those in power.
The brilliance in forking over those unpopular means to unelected officials is not even half of what was achieved by those dictatorial dictator wannabes. How they sold it to the elected officials and justified it to the People is the real brilliance. That's what happens when people who seek power instead of to serve are elected. You see, power doesn't corrupt. The corrupt seek power.
So, don't believe any of the rhetoric(lies, damn lies, demagoguery, dissembling, and phony statistics) these disarmers are using. It has nothing to do with "the safety of law enforcement" and everything to do with turning us into impotent subjects of their utopian state. Let them know that you know what they are up to and will not stand for it.
Back when the Constitution was written and ratified, a constitution was defined as a government - like a monarchy is a government, or a dictatorship is a government, or an oligarchy, or a theocracy. Those we elect are not our government - the Constitution is! Those we elect are only supposed to serve the government! Keep that in mind when you write your letters as well.
Let them know that we know that a disarmed populace is nothing more than villein, subjects, and serfs - and if not in the beginning, certainly in the end! Let them know that we have more than the freedom of speech and the ability to assemble and petition for a redress of our grievances. We also are equipped to defend our rights and freedoms. Yes, we have the power to be defiant. Let them know before the foreseeable "long train of abuses" we are disposed to suffer becomes insufferable.
Woody