“They can’t confiscate something they can’t find.”
But if they can’t find it, you can’t use it either!
“But if they can’t find it, you can’t use it either!”
That’s why you have neighbors, relatives and nearby acquaintances.
Go to the White House. Aside from the guards, there won’t be any weapons. But they provide weapons for any number of critters from drug lords to despotic regimes. No one can find them but they can use them.