The tools of modern terror: How the AK-47 and the AR-15 evolved into rifles of choice for mass killers

Mass shooting, Definition, Statistics, Weapons, & Locations

Submachine Guns (SMG's): Outpaced by Today's Modern Short-Barreled Rifles (SBR's)/Sub-Carbines, or Still a Viable Tool for Close Quarters Battle/Close Quarters Combat (CQB/CQC)? – (DR): An online tactical technology and military defense

How AR-15-style rifles write the tragic history of America's mass shootings

How good is a new Russian assault rifle AK-15 compared to the US's M-16? - Quora

The Evolution of the Boogaloo Movement – Combating Terrorism Center at West Point

Understanding the El Paso Massacre - Columbia University Press Blog

Authors of 'American Gun' on deadly history of the AR-15 - Los Angeles Times

American Tactical Galeo Rifle: Classic Israeli Galil Reborn! - Firearms News

How the AK-47 and AR-15 Evolved Into Rifles of Choice for Mass Shootings - The New York Times