The media, and the gun controllers all concentrate on getting the mis-labeled, lawfully obtained firearms away from the responsible owners, but never talk about the perps' sources of supply.
Registered???
Only Class 3 firearms require registration in GA ;-)
I think I agree with the intent of your post (accurate and truthful reporting?) but respectfully disagree with three of your specific points.
In many (most?) parts of the country, firearm registration is NOT required, and reporting that a gun used by a homeowner was 'unregistered' would suggest to many readers that it was an illegal firearm.
In many (most?) parts of the country, a family member or friend is not prohibited from using your firearm. Stating that a gun that was used in self-defense was not owned by that person, might suggest that the person defending themselves had comnitted a crime.
Finally, the specific make and model of a firearm can be difficult for even an 'expert' to determine, and is often completely irrelevant...