alt Hacker NewsFully automatic guns maybe not, but the founding fathers definitely knew about repeating firearms, they had more than a few offers to purchase them, both for military uses and as private citizens. They just denied to because it was expensive to purchase and maintain.
No. While originalists and textualists purport to refuse to extend any principle into the modern day ("no right to privacy in 3A, 4A, etc"), one they do is that 2A doesn't merely apply to arms of the day, but also to modern arms. It's... pretty blatant.