The firing pin hits the eraser and propels the pencil. I've heard of it used to check firearm function (by popping the pencil straight up in the air), never as a marksmanship trainer as described above.
Jack
P.S. I'd imagine someplace, sometime, somebody propelled pencil fragments into their ceiling (and possibly their face) with a 230 grain booster rocket.
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Why do you guys hate black circles so much?
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