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>Its irrelevant whether there will be massive amount of firearms left. Nobody expects the full effects will be visible within months. Using that argument is just a lame excuse of doing nothing. If we can make it more difficult for teens and young adults to purchase a gun (let alone automatic guns), go to their university and slaughter people by the dozens it is a win already. The real gain will take many years as it did for example in Australia.
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Australia had mandatory confiscation. Completely and totally impractical. And by the way, assaults and sexual assaults have skyrocketed in Australia since the confiscation. That's from the Australian Institute of Criminology

But aside from that, that wasn't the reason for the question and wasn't the point I was trying to make.

Take a look at the stats on race and federal gun crimes in the U.S.
This article should be required reading for everyone:
http://www.the-american-interest.com/2015/10/02/gun-control-more-racial-disparities-than-the-drug-war/

I am all for having open debate on serious policy changes. I am fine with targeted proposed legislation on topics like criminalizing the existing loopholes on gun transfers....I am fine with stronger background checks. But one of the problems we have is that existing laws are not being enforced. You can pass 100 laws and it won't mean a bloody thing if they are not enforced.