just because you can print these parts means nothing, you have to have the correct type of plastics. Frankly I am not concered over all of it. The way they are preventing people from being a threat is limiting the ammo supply. So unless you know how to make gun powder and have all the equipment to make your bullets and casings, as well as primers. You still only have just a fancy spear that makes clicking noises. all from your own computer. for that note, ever heard of a zip gun or a pipe shotgun? they are increadibly easy to make and take no computer to make. ponder on that one.