Actually in Missouri there are several ammo manufacturers.
Sedalia, St Louis, KC. St Louis and KC are pretty much military grade. Definitely a possibility.
Whats to stop the franchising of particular models or parts to Joe’s Machine and Tool Shop?
For starters a 12 ga pump, 30-06 bolt action, 10/22 and a 38/357 revolver for the bare essentials manufactured in Missouri.
Then Joe would need to multitask with thousands of models just to keep the economy healthy.
Capitalism would then cause more ammo to follow the money trail.
You've nailed it!