Good for them and us. I will be augmenting my own collection and will purchase from these true patriotic manufacturers. Semper fidelis!
Call, mail, email, or otherwise contact the manufacturers from whom you have purchased weapons and indicate that you feel that it is important that they choose which side they are on.
Be polite, but inform them that their actions at this critical moment will have repercussions. Inform them that your continued commerce is contingent on their strong defense of the equal right to keep and bear arms.
The civilian market is huge, they must be forced to stand with it or commit commercial suicide.