25mm Flare Rounds
thingiverse
Emergency flares that can be fired through a 1-inch ID pipe come with two shells - .22LR & .38SPL. Blanks are used to launch the flare projectiles, giving them a rifled twist of one turn in 25 inches. A left or right twist is available for choice, and the .22lr shell is offset to accommodate rimfire cartridges.
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