re: What's the best argument against an all out AR ban?

"...The right of the people to keep and bear arms shall not be infringed."

Let's start with a couple definitions. All taken from Google.

Arms - weapons and ammunition; armaments.
Weapons - a thing designed for or used to inflict bodily harm or physical damage.
Infringed - act so as to limit or undermine.

Now that we know what we are talking about. Let's list something's that we can all agree on are weapons.

Knives
Bats
Batons
Swords
Guns

Are there types of guns that are illegal to own currently? If so the illegality of those guns, which are weapons, which are arms, is being limited.

So yes the restrictions on the second amendment are overstepping the amendment to the Constitution.