The reason thumb-over-bore technique is catching on so quick is how much more speed and control it gives the user. Your support hand is only moving a small portion of the barrel, which allows the user to drive the firearm from target to target quicker. I used the 'traditional' method of firing from the prone but would use the thumb-over-bore for CQB in the Army. That wasn't from the FM but it worked for me.
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Good equipment will never be a substitute for good training.
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