The larger question is if going out on the mesa and unloading a bunch of Wally World ammo is enough for Homeland or some other agency to "send in the scoops? Do you have to shoot in a formally regulated environment? Is it the wearing of the camo? Black rifles? Three or more shooters? Doing push-ups?
What makes it paramilitary? What is the trip wire for the offense.
When does it stop being plinking, and become a crime?