It is sad though that even after classrooms full of kids are massacred there is still no political will to enact even basic changes to have background checks.
Background checks are required. Any licensed dealer is required to perform background checks. I'm a manager at Walmart and have sold somewhere around 300 guns in my career. They all had to pass a background check.
What isn't required by most states is background checks for private sales. In other words, you can go to a gun show say in the state of Florida with your gun. You can then sell it to anyone there and not be required to perform a background check. That is the loophole some feel needs to be fixed. Federal law defines a private seller as anyone who doesn't rely on gun sales as their principal means of financial support.
I'm all for gun control laws. I like Chris Rock thoughts on the topic
https://www.youtube.com/watch?v=OuX-nFmL0II