I was pleased to see that the author recognized that for some of us, carrying the same gun in the same place just isn't practical. That said, he makes a very good point. Under stress the best we can hope for is to live up to our training. Years ago, when I taught CPR, I spent more time on the initial reaction and assessment of the victim than anything else. Why? Simple, if I could drill that reaction into my students, chances are that's how they would react in a real medical emergency - and if they did the assessment, chances are they will actually do what is needed. Same principle applies here.