So you want them to employ telepaths so they can read the minds of customers or something?
Works for me.
How do you expect the store to be able to predict what a buyer is going to then do with a purchased gun?
For example, I like to try different guns, and then resell them, often at a profit as the value goes up over time.
How is a gun store going to know that, or why should they even care?
That's the point. To make them care. If you can be sued because you sold to a gangbanger or a person who thinks they are the Joker, you are going to care who gets your guns.
The problem is, right now, the gun industry DOESN'T care.
Any store has to make at least $1000/day just to be able to afford to stay open.
Assuming about half profit markup, that is $2000/day gross, which at $500/gun, is 40 guns/day.
Which is about 15k guns/year.
You work on the assumption that I care if gun stores CAN stay in business selling death and suffering. I really don't.
So then 850 is a tiny and insignificant number, that get involved in crime.
And there is nothing to indicate any criminal came to this store.
The 850 could all have been stolen from honest buyers.
one gun getting into a crook's hand, I can give them a pass. 850? they're in on it.