I think you may not be caught up to the current state of the art in printed firearms. Since the lower receiver of an AR-15 is legally the "firearm", it's the only part you need to create yourself to bypass infringements. The lower receiver is also not much of a pressure-bearing component, so making it on a 3D printer offers few trade offs. There are other prints available for countries with even more restrictive infringements, where you can print or assemble the entire weapon from unregulated parts (which are commonly used in other situations, making them difficult or impossible to regulate).
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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I think you may not be caught up to the current state of the art in printed firearms. Since the lower receiver of an AR-15 is legally the "firearm", it's the only part you need to create yourself to bypass infringements. The lower receiver is also not much of a pressure-bearing component, so making it on a 3D printer offers few trade offs. There are other prints available for countries with even more restrictive infringements, where you can print or assemble the entire weapon from unregulated parts (which are commonly used in other situations, making them difficult or impossible to regulate).
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)