For a non gun person perspective I ask: why are these mass shootings being done with AR15s usually? If I was going to do something crazy like this, the 1st thing that comes to mind is how bulky and heavy it would be to carry all that ammo and a big AR15. What advantage do these things offer over pistols/handguns? It would seem to me like handguns would do the same job since you wouldn't expect your targets to be wearing body armour.
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