The original intentions of the 2nd amendment aren't known. The people who wrote and passed the 2nd amendment didn't write their intentions down clearly and their intentions weren't necessarily all the same and the text itself doesn't make the intentions at all clear because it's quite badly written in terms of clarity. The relationship between the first and second parts of the sentence isn't clear. The relevance of the first part of the sentence, if any, isn't clear. What "bear arms" was intended to mean isn't clear. For example, there's absolutely no doubt that the people who wrote and passed that law were aware of the fact that guns had already become much more efficient by their time and were continuing to become more efficient in their time. So why presume they definitely meant for further improvements in efficiency to be excluded from the law they'd written and passed? That's not in the text of the law and there's no reason to think they intended it to be.
