I've used GOA legislative feedback links dozens of times. Many of their legislative rebuttals are more aggressive in tone than the NRA legislative links, that include their rebuttal text.
You may modify accordingly, as well.
I've deluged my representatives with them, NRA, and all firearms manufacturers legislative links, as well as hitting my state representatives email boxes as often as I may.
They, (according to my views) are one of the better groups to have on our side.
And as a final note, don't forget PopVox.