On the assumption that the best I am likely to achieve is another tick mark on a tally sheet, I opted for short and unambiguous.
"As the 2nd amendment is a restraining order against governments' power to violate the civil rights of its citizens, I strongly oppose new gun control legislation.
Please, look beyond the emotion and demagoguery following the recent shootings. I believe that new legislation is unneeded, new legislation enacted in haste almost certain to violate my rights. "
That went to my federal and state political hacks, subject line "Civil Rights."