I've seen these versed used for pro-gun purposes. If I read the above verse in that context, then how could two swords be enough for the eleven disciples? Just asking.
I think the point is that (while Jesus would shortly thereafter tell disciples not to defend him personally with the sword), they would be both permitted and expected to physically defend themselves once He was gone. He also did not want them to make weapons central to their work as might have been the case if they were all armed. I see this as one of many examples of the same message we see in Ecclesiastes 3:1 "To every thing there is a season, and a time to every purpose under the heaven." Self-defense? Yes. Allowing that task to interfere with their primary mission? No.