Your entire approach is based on the belief that more guns == more murders. This is supported by looking at Australia's bans and the ensuing drop in gun murders. This is contradicted by the increase in the amounts of guns in the U.S. during the same time period (AND the concurrent expiration of the assault rifle ban), which was accompanied with a similar drop in gun murders. This tells me that there are bigger variables at play in gun murder rates than simply the number of guns or access to guns or bans on types of guns.
"When you've begun to think like a gun
The rest of the year has already gone
When you've begun to think like a gun
The days of the year have suddenly gone."
- John Cale, "Gun"
Gun
John Cale
Me and my partner we work on the run
The quick try to get quicker
And the creepers get hung
Now it's you that got wasted tonight on the job
One lost his liquor
And the other lost his hand
Ten sticky thumb prints on the door and the sink
But nothin' saw nothin' - just smell the stink
Five hundred mugshots and a hundred to one
Four forgotten and the rest just won't come
When you've begun to think like a gun
The rest of the year has already gone
When you've begun to think like a gun
The days of the year have suddenly gone
blood on the windows and blood on the walls
Blood on the ceiling and down in the halls
And the papers keep downing on everything I burned
And the people getting restless but they'll never learn
I picked up a doctor - he's good with a knife
Says…