I'm much more concerned about who has a gun than what gun they have

[flamin lib]

14. The weapon of choice is shifting to the relatively short high capacity and rapid fire AR style

rifles. They are designed for close combat and urban warfare door to door encounters. They are, by design, an offensive weapon.

WW I rifles were designed for trench warfare; two ditches 400-600 yards apart. The technology available at the time dictated long barrels and heavy bullets.

WW II tactics had some of the same requirements but began the transition to street warfare which placed greater emphasis on rapid fire and portability.

Vietnam was jungle fighting where line of sight is limited to quite short distances negating the need for accuracy at great distances.

To turn around in the average hallway with a WW I or II infantry rifle requires turning it vertical whereas an AR with the stock collapsed is almost as maneuverable as a handgun.

Admittedly it is more difficult to conceal but if an act is premeditated there really isn't much warning or time to react. Aurora and Sandy Hook are good examples.