Let's face it step one of a Active shooter event is GET yourself and family members/near by co-workers out safety , If you can't get out -HIDE till the good guys show up, at no point do you go hunting for the bad guy if you are not a COP. One of the self defence tv shows when they did a Active shooter show had Mr CCW seraching the halls for the shooter --Big problem you come around a corner and see a coworker with a gun do you stop and ask him if he is the shooter or do you shoot him and say opps ,the same thing with a cop yells at you to drop the gun and you go what -he unloads his glock /12 ga on you .You only use your gun if run into the bad guy as you are trying to get out . Having a rifle in your car/truck is great if you end up in a bad place ,you can't drive out of -ie blocked in traffic and bad guys/zombies/et /obama voters are coming your way to do bad things to you ,so do grab the rifle and block the road with their bodies .