Especially with "80%" gun frames out there, which aren't too hard to get, and don't require any sort of background check in many jurisdictions, since its technically not a firearm, just a block of polymer you dremel down to spec.
While this is technically possible, it is not that easy. In other words, someone who is technical and experienced enough to manually create a lower like that is very likely to have extensive experience with firearms anyway (and likely owns many).
While this is technically possible, it is not that easy. In other words, someone who is technical and experienced enough to manually create a lower like that is very likely to have extensive experience with firearms anyway (and likely owns many).