Edit: Perhaps you mean less work (an assumption), not knowledge. Knowledge is not the same thing as work. Every town blacksmith could make potentially make a gun barrel at one time. Things are easier today with modern machine shop tools.
Guns are not high tech items. They were originally crafted.
And for the support of this Declaration, with a firm reliance on the protection of Divine Providence, we mutually pledge to each other our lives, our fortunes and our sacred honor.