The next victim-disarming idiot who uses a smart phone connected to a computer network operating over fiber optic lines to tell me the framers of the Constitution and the Second Amendment never envisioned modern firearms, and that the Second Amendment only protects muskets is getting bitch-slapped.
James Madison, known for his role in drafting the Bill of Rights (including that pesky 2A) lived through the rise of repeating firearms, breechloaders, paper cartridges, percussion caps, metallic cartridges, pinfire cartridges, centerfire cartridges, revolvers, and mass production of firearms.
Heck, an early machinegun was pitched to the US War Office in 1812, and patented in 1813 — during Madison’s presidency (and was a refinement of a 16th century machinegun).
Yet never once did Madison stop and say, “Whoa, guys! We didn’t have any of this new shit in mind. the Second Amendment is just for muskets.”
Random Acts of Gibberish 
I don’t know if you are aware of the Pickle Gun. You make mention of a “machine gun” from 1813 in the US. The Pickle Gun predated that by 100 years. In 1718, in GB, the Pickle Gun was patented. It was a crew-served flintlock repeating weapon, that tripled the rate of fire of a single musketeer.
Here is the wiki page, with the patent drawings:
https://en.wikipedia.org/wiki/Puckle_gun?fbclid=IwAR1lJnyctKLCMhIEWEJFicS3-pnE0LIGNBk9jvZ7wljjPDhnMOp6HMA_uoA
And here is a youtube video with an actual, mostly original, working Puckle Gun:
A truly fascinating piece of machinery.
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I forgot Ian covered the Puckle gun. I knew of it, but it required a separate act to fire each shot. The Chambers system I was referring to fired multiple rounds with a single pull of the trigger. It was a superposed load system. The first round in front fired, and a channel direct a bit of fire back the next charge, and so on in turn.
In fact, Chambers’ design was a refinement of a superposed “machinegun” dating back to the 16th century (possibly earlier) in which the projectile was a slightly undersized ball allowing some flash leakage back to the next charge. One pull of the trigger, multiple rounds in succession (Wikipedia compares it to a roman candle). Chambers’ 19th century version would allow proper sized balls for better accuracy.
Other repeating, but not machinegun, variants used superposed loads with a sliding flint lock: fire the first round, slide the lock back to the next, cock and fire; lather rinse repeat.
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