What Did the Founding Fathers Intend When They Wrote the Second Amendment?

Here we ago again.
With the latest mass shooting at Parkland’s Stonemason Douglas High School in Florida, gun-grabbers are out in full-force, blaming the NRA, demonizing so-called “assault rifles,” and threatening to take away firearms from all law-abiding citizens.
So, what does the Second Amendment really mean? Does an American citizen have a Constitutional right to own a gun?
There seems to be some confusion whether or not gun ownership is a right for all Americans, or just for a small militia.
In this Prager University video, Eugene Volokh, Professor of Law at UCLA, explains what the Founding Fathers intended when they wrote the Second Amendment: