I wrote him too.
My letter was more of a, "I noticed the poll on your senate page shows that 96+% of people do not support an assault weapons ban. Do you plan to listen to the people who elect you or leave us out to dry? Blah blah blah, you've been anti-gun in the past but I hope not this time... blah blah... remember what happened in '94...blah blah"
No response yet, but my letter was clearly pro-gun, and a firm reminder that voting to ban a specific set of firearms would cost him his job (hopefully).
Looking forward to the response, probably will be word for word what you received.