Makes sense. How long would it take to deploy in a real world situation? How do you train as you fight (as in, bullets flying your way)?
I see Tim Kennedy carries a FN FiveSeven becasuse it's like a rifle in a handgun.
So there are a lot of variables one needs to consider when being this hypothetical, and because of that, I try to just be realistic as possible. The way I've trained, is I'm sure I will almost always go for my carry pistol when reacting when seconds count. The AR pistol is most likely going to be for when I have a minute to consider things. For instance, in the Walmart shooting, I'm sure it would have played out something like this:
"Oh **** are those gun shots? Damn that guy's shooting people! Babe I'm going to stop this guy before he kills over 20 people." I grab the AR pistol, tell the wife to drive herself and my kids to safety, and give that ******* what he deserves.
However, if I were INSIDE, I would have only my pistol. Even if I was outside, around the entrance I would have no thought of running to my SUV for the AR, I would try with the pistol. I know some people say stuff like that when they would possibly run, but I've been involved in situations in my life, none of which were anywhere near the scope of the walmart shooting, but none the less, it turns out I'm a "fight" guy. Especially when innocence is at stake.
As to how long it takes to pull out of my truck safe and get into full readiness, even my first try was less than 30 seconds. I've had my wife sit in the passenger seat and time me and the average time is (With the mag out) around ten seconds, and that's relaxed. The red dot stays on all day so I don't need to mess with that.
Under stress, given account for shakiness, distractions, and any errors, it could take up to 20 seconds, I suppose. In my opinion, that's no time at all and if things are way too urgent, you don't even think about it and should go for the pistol.