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I used to have an old telephone company hard hat, the sturdy fiberglas kind, that I used to show in my home firearms safety classes, with a hole the size of a quarter near the right temple. A couple of co-workers playing around with a starter pistol put the hole there, and those were the blanks specially made for that type of started pistol, something like .25 rimfire, that wouldn't load in any conventional gun. The gun's barrel was bored through and then had two cross pieces in it, so the gasses went out the muzzle, and not to the sides like most of today's started pistols.