The 7th Amendment - Trial By Jury

Because Our Forefathers recognized that absolute power bred elitism and elitism bred arrogance, and arrogance bred contempt for the common man:

Amendment VII
"In suits at common law, where the value in controversy shall exceed twenty dollars, the right of trial by jury shall be preserved, and no fact tried by a jury, shall be otherwise reexamined in any court of the United States, than according to the rules of the common law. "

But not only does this provide for the right of the accused to be tried by a jury, it also sets "common law" as the precedence. And that is the reason why lawyers argue about cases of old, where a ruling was made in the favor of their argument.

"Common Law" simply means that if a court has previously found that owning a firearm is your right, then your judge must find the same in your case.