Which of those efforts will keep gang-bangers from shooting little girls through the walls of their bedrooms in a drive-by shooting in Portland, Oregon?

Look at the FBI statistics on gun deaths.  After you eliminate the suicides, the 'islands of death' are in NE Portland, South Chicago and similar locations.  

Your odds of being killed in Portland are the worst if you go to a strip club there.  

We don't have strip club shootings in Eugene or Springfield.  What is the difference between the two locations?

The guns are illegally purchased. 

More 'statistics' aren't going to change those facts; they have been constant for decades.