NRA found this document by National Institute of Justice: http://www.nraila.org/media/10883516/nij-gun-policy-memo.pdf
Summary of Select Firearm Violence Prevention Strategies
The things highlighted are worth reading.
Summary of Select Firearm Violence Prevention Strategies
Universal background checks Twitter summary: Effectiveness depends on the ability to reduce straw purchasing, requiring gun registration and an easy gun transfer process
The things highlighted are worth reading.