Minimum 20 extra years for use of a firearm in a crime.
Minimum 20 years for illegally selling a firearm to a criminal.
We need to be careful with blanket regulations like that.
For example, if I'm wrongly accused of shoplifting and happen to be carrying at the time, that could be a real problem for me. What if I sell a gun privately to someone who gives no indication of being a criminal? Do I deserve to spend a significant portion of my life in prison?
It's well-meaning on the surface, but in practice, it has the potential to be very problematic. This is how things like the Lautenberg amendment create so many problems.