Here's some context about the understanding of the world and how it pertains to the 2nd Amendment
The following elements that we use in our lives or have some sort of technology linked to them (like satellites) were unknown at the time (Not an exhaustive list):
Titanium
Lithium
Sodium
Potassium
Beryllium
Calcium
Cadmium
Boron
Fluorine
Silicon
Gallium
Selenium
Iodine
When trains came out in the industrial revolution, people thought that going over 32 mph would cause madness or even suffocation of passengers.
https://www.google.com/books/edition/The_Railway_Train/5D0SzfX3j4EC?hl=en&gbpv=1&dq=passengers+would+suffocate+%22train%22&pg=PA12&printsec=frontcover
Anesthesia in medical procedures is a recent invention. Many argued AGAINST using it at first. There was a medical opinion that pain was a vital component of surgery. Some even outlawed the usage of it.
https://www.hedweb.com/hedethic/end-suffering.html
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So when they wrote the little flourish on "shall not be infringed" and one of them spoke up and said something like "Can you imagine if these muskets could fire a hundred times faster?", they would have been told the period-appropriate version of "ha ha, shut up".
It would have been seen as how we see Wolverine's skeleton and claws, plasma rifles, and lightsabers. The stuff of fantasy.