The first repeating rifle used in combat by a military force was a flintlock system developed by the Kalthoff brothers. It was adopted in the 1640s by the Danish Royal Guard, who purchased a bit more than 100 of the guns, and used them successfully in the Siege of Copenhagen in 1659. The Kalthoff is a .54 caliber flintlock rifle with a magazine of 30 balls under the barrel and a powder storage compartment in the buttstock. A lever under the action is rotated forward 180 degrees and then back to completely reload the rifle – this action loads a ball into the chamber, seats it fully in place, loads powder behind it, primes the pan, cocks the hammer, and closes the frizzen. This was an amazing amount of firepower in the mid-1600s, and the mechanism in the gun is brilliant.
The Kalthoff brothers (Peter, Mathias, Caspar, Henrik, and William) spread out across Europe working for many royal courts although it was in Denmark where their gun saw the most substantial military use. The system would lead to other repeating flintlock designs like the Lorenzoni, but these did not really meet the quality of the original Kalthoffs (in my opinion). However, the system was very expensive to make and rather fragile to use. By 1696 the Danes had taken them out of service in favor of simpler and more durable designs.
From my quick read of the Natual Aristocracy page it sounds like he describes two kinds of people, those who got power and privelage through personal drive and action (a person who starts a company, invents something, leads an organization, advances research) and those who inherit the status and money with little effort on their part (decendents of royalty, trust fund babies etc).
So the idea of finding people with talent and passion at all levels of society and helping them succeed through higher education isn't far fetched. It sounds a lot like how modern scholarships work to me. Yes their idea of "equality" is not the same but we've come a long way.
In that very article they quote him saying that gunpowder has armed both the weak and the strong. In context he's referring to the desire for physical strength/fitness but that can also go for cultural strength as well. The second amendment, here and now, allows the "modern subcultures" you mentioned to have firearms same as any other citizen.
Yeah his mindset didn't include women or people of color but it doesn't make the core idea invalid, which is that not everyone should have power, even if they are rich, but that everyone should have rights.
"Yeah his mindset didn't include women or people of color but it doesn't make the core idea invalid"
I'm not sure how you could think that the founding fathers could exclude people and still mean everyone. "Everyone" specifically means not excluding anyone.