A lightweight aluminum and steel model felt best in my female hands. I also bought a box of 38 Special Hollow Base Wad Cutter bullets and went home and learned how to aim, fire and handle the recoil. I carry the gun in a fanny pack for easy access. In addition I bought tear gas pepper spray and learned how to use that. A choice of options is very important depending upon the situation.
Some schools have armed security.
I know other teachers who possess guns. I don't know if the guns are under the front seat of the car or somewhere else close by. But, they thought that some of their other teachers should carry guns. In surprising ways our older children actually take comfort in the idea of armed people in charge. I think a percentage of educators will be publicly armed in time.