http://www.nraila.org/media/10883516/nij-gun-policy-memo.pdf

This NIJ (DOJ) report contains some gems, for example an admission that universal background checks, to be effective, would require gun registration.

But the report has some quirks. For example, while admitting that mass shootings only take an average of 35 lives each year, and that policies should address the broader homicide picture, the report goes on to state that gun lethality would be reduced by banning large capacity magazines, without any analysis or consideration of the utility of large magazines in common defense situations involving multiple attackers (about 20% of cases), or exactly what difference magazine capacity makes to a killer facing a room full of unarmed school children when it only takes a second to swap magazines.