Besides the other points people have made, there's another reason printing currency is different than guns. You have to spend money somewhere for it to be usef

Besides the other points people have made, there's another reason printing currency is different than guns. You have to spend money somewhere for it to be useful. With guns, nobody has to accept being shot, they just are. Another thing is there is no possible way this could be enforced before strong AI that can recognize a functioning gun somehow.