I've tried it - someone told me it was a way of reflex shooting? It's ok - all my guns function fine when I've tried it, and I've never had a loss of control when I've used this method.
For me though I've put so much effort into learning and shooting with my index finger as my trigger finger that it feels incredibly odd to use another finger. But, having tried it, I know it can be done and it will work fine if I find myself without my trigger finger (a la Tom Berringer in the movie Sniper?) best of luck!
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