This isn't a Red or Blue issue, and we do ourselves a disservice by assuming such.
At least two R members of the US house changed their minds and voted for the AWB after appeals from Ronald Reagan, the "gunowners champion": The house minority leader voted for the AWB.
In 2004 the US senate voted to extend the AWB as part of another bill. Ten R senators voted in favor of extending the AWB: Six D senators voted against extending the AWB. The vote became mute when the cover bill was voted down.