A large fraction of the harm from firearms comes from their ability to fire rapidly which didn’t exist when the constitution was written. As such it was making a very different balance of risk between the general public and individuals.
Very obviously individuals were expected to be part of the militia, which was the military at the time (c.f. the Militia Acts 2 years after ratification requiring individual gun ownership and very clearly laying out that all able-bodied white male citizens aged 18-45 were part of the militia), but also states could regulate weapons if they wanted.
Not a firearm.
I didn’t say we could ban compressed air powered guns, I specifically said percussion caps. The Girardoni was way less dangerous than a modern handgun.
In the 230 intervening years, we've vastly increased the scope of the federal government and developed a formal military, so one might argue we ought to amend the constitution to change exactly what's allowed under 2A (e.g. it should be straightforward to have a nuclear weapons ban added with unanimous agreement), but as it stands, 2A (+14A) clearly gives individuals the right to own the arms necessary to run a functioning ("well-regulated") militia, which in 2026 means at least semi-automatic firearms.
Thrown stones are a fast firing deadly weapon. They, compressed air guns, and ball musket etc aren’t used by modern military forces in combat because they are less dangerous.
A rule that allows compressed air weapons yet bans percussion caps is quite reasonable and could pass constitutional scrutiny.
Banding heavy machine guns yet another invention after the constitution was written didn’t, so there’s clear present this wouldn’t either.
Supreme court rulings are arbitrary as they regularly reverse or update standards, sometimes multiple times.
From Heller v. DC:
“Some have made the argument, bordering on the frivolous, that only those arms in existence in the 18th century are protected by the Second Amendment. We do not interpret constitutional rights that way. Just as the First Amendment protects modern forms of communications, e.g., Reno v. American Civil Liberties Union, and the Fourth Amendment applies to modern forms of search, e.g., Kyllo v. United States, the Second Amendment extends, prima facie, to all instruments that constitute bearable arms, even those that were not in existence at the time of the founding.”
A few years after that ruling, the Massachusetts state supreme court upheld a conviction for a woman who had carried a taser for self defense. The Supreme Court accepted her challenge, allowed it to go forward without paying court costs, and unanimously overturned that ruling without asking for oral arguments ( https://supreme.justia.com/cases/federal/us/577/411/ ):
“The court offered three explanations to support its holding that the Second Amendment does not extend to stun guns. First, the court explained that stun guns are not protected because they ‘were not in common use at the time of the Second Amendment’s enactment.’ This is inconsistent with Heller’s clear statement that the Second Amendment ‘extends . . . to . . . arms . . . that were not in existence at the time of the founding.’
“The court next asked whether stun guns are ‘dangerous per se at common law and unusual,’ in an attempt to apply one ‘important limitation on the right to keep and carry arms.’ ... In so doing, the court concluded that stun guns are ‘unusual’ because they are ‘a thoroughly modern invention.’ By equating ‘unusual’ with ‘in common use at the time of the Second Amendment’s enactment,’ the court’s second explanation is the same as the first; it is inconsistent with Heller for the same reason.
“Finally, the court used ‘a contemporary lens’ and found ‘nothing in the record to suggest that [stun guns] are readily adaptable to use in the military.’ But Heller rejected the proposition ‘that only those weapons useful in warfare are protected.’
“For these three reasons, the explanation the Massachusetts court offered for upholding the law contradicts this Court’s precedent.”
The fact that Caetano was a unanimous and thorough ruling says a lot to me. Perhaps you’re holding out hope that Heller will be overturned soon, but the chances for that are very slim ( https://youtu.be/nFTRwD85AQ4 ).