I would suggest changing the word "Democrats" to "Anti Gun Lobby" or something similar. Remember, this letter will be going to members of both parties. While the party seems to toe the line overall, not all Dems are anti gun and also some Repubs side with the anti gun.
If this were strictly divided across party lines there would be no need to send to Rebubs in the first place.
Personally, I consider myself Independent. I happen to side with the Dems on many issues, but the Gun control issue is one that I do not.