I've tried the technique at the range only and it seems to work very well for close in rapid target defeat.
It offers a very strong position and a very low probability of weapon take away. But it is a technique that needs to be practiced a lot. I would wager to say that the firing position alone could cause some concern to some shooters. The fact that you are not always extending your arms to the "normal" strong position is alien to some.
Paul Castle seems to be the 'expert' on the technique.
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