My understanding is that printed lower receivers is an artifact of how the USA regulates ARs, most countries regulate barrels and other components as well. So that method is extremely vulnerable to additional regulation. Anyways, finished 80% aluminum lowers are just as good as the real thing, you can even hard coat anodize (similar process to the barrel rifling of the FCG-9)
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My understanding is that printed lower receivers is an artifact of how the USA regulates ARs, most countries regulate barrels and other components as well. So that method is extremely vulnerable to additional regulation. Anyways, finished 80% aluminum lowers are just as good as the real thing, you can even hard coat anodize (similar process to the barrel rifling of the FCG-9)