There is a lot of misinformation by Gun Owners of America out now, claiming the UBC is just a pretext for a gun registry--which is a pretest for gun confiscation--which is a pretext for....
I think you should always make your letters to Congress critters respectful but firm and clear, using facts, polls, etc. As I understand it, they rarely read those letters, so being harsh or going all caps is just making it hard on some lowly staff person. The staff person usually reads the letter and then tallies it as a "for" or "against" on a particular issue; sometimes they send you a form letter back. The Congress critter does read the results of those tallies, and with enough tallies, it might sway him or her.
Thank you for taking the time to write letters. Your service to your country is much appreciated. 
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