Some people can over analyze things. The grandma did not attribute her victory to quality of weapon, choice of caliber, training, tactics, forum post count or anything like that.
She said she believed she was going to die and wanted to take one of them with her. I believe her.
"The ultimate authority ... resides in the people alone. ... The advantage of being armed, which the Americans possess over the people of almost every other nation ... forms a barrier against the enterprises of ambition."
- James Madison