When I was an NRA instructor the most common problem we had to correct was people crossing their thumbs behind the slide of a semi auto pistol. If you didn't catch them in time you had to administer first aid. Amazingly the other day I watched a video shot at Les Baer's factory and they went onto his range to test some guns. Les is apparently left handed and he crosses one of his thumbs BEHIND the slide when he shoots. He never got bit but I was amazed that he learned to shoot that way. (maybe he has some type of medical/physical problem with his hand)
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