Actually, the founders did NOT consider muskets as personal weapons. Personal weapons in those times were knives and swords, which arms were outlawed throughout Europe at the time of our revolution.
Muskets and shot guns were for filling the pot or waging war. Knives and swords were the main weapons of individual self defense; no need to consider how to reload a single shot sword or knife.
"...deliver services that freely-associating men can do for far less and at a far better price, AND for a profit."
Gee, we had such a system in this country at one time; it was called SLAVERY. The "freely associating men" provided really inexpensive services, such as building the nations capital using artisans they had enslaved.
Libertarianism is a very thinly disguised appeal to elitist rule, otherwise know as unequal rights for all.
Just read your Ayn Rand a little more closely.