So yeah you can fire a bullet so many different ways, a rusty nail and hammer will do the trick. Isn’t the real problem the frickin bullet?
I swear in Sweden or something, you can take a gun home but ammo is only sold and consumed at the range and not for taking home.
Sure, you can make this a hollistic approach regulating guns and ammo, but the ammo seems to be the bigger issue here. You can make guns easy peasy, but ammo is much harder to manufacture and easier to regulate.
Its much harder to cobble together a decent zipgun or slamfire than it is to reload a casing, not that either are particularly hard.
The brass is going to be the hardest thing to manufacture in bulk. You can cast your own lead, mill your own powder, and refill primers at home in your kitchen.