The definition of felony is slipping. I have a friend who is a felon because his dog jumped a fence and chased a deer. Naturally he has lost his right to bear arms.
~11% of Americans are convicted felons but less than half of all those felons have been incarcerated.
The original definition of "felony" (and the one Scalia uses)is: A serious crime punishable by death.
That would be one of the more serious of modern felonies :(
Actually, I would bet that the vast majority of Americans have committed or will commit some kind of felony during their life without ever even suspecting it. The charge of felony is becoming meaningless in determining the genuine seriousness of a crime.