You have no idea what "we" will be demanding. Pure speculation on your part.
The Democrats' long history of insisting that handguns are more dangerous and therefore require a higher purchase age is plain to see.
It is very clear that if we give in to demands to raise all guns to the same purchase age, we'll see a quick return to demands that handguns have a higher purchase age.
If all you want is for all guns to have the same purchase age, you can achieve that by rolling back the handgun purchase age back to 18.
Every political party opposes impaired driving such as DUI/DWI. Yet when it comes to weapons, somehow it's only the Democratic party that seeks change.
The Democrats don't seek change. They seek laws that will do nothing but violate people's rights for no reason.
"We" already have a federal system in place for felonious charges. Try getting a loan, a job or credit without submitting to a background check. It doesn't happen.
If there is a number that I can call to get a federal background check on my neighbor, what is it?