Basically what this says is that since all federal gun laws are based on a very tortured reading of the interstate commerce clause, if a gun is built in Utah and stays in Utah, it doesn’t fall under federal jurisdiction. Ergo, non of the federal laws apply, only state laws.
Montana was the first state to do this. Most of the red states are considering something similar.
This is a very good thing. States are starting to stand up against the federal leviathan.
If you live in Utah contact your reps and let them know how you feel.