Rich, I remember seeing .22 LR sub-caliber devices like the one you have pictured at gun shows back in the 1970's... One popular caliber was .30-30 Winchester. So a deer hunter could put one in his lever action and pop a very close range rabbit of opportunity without spooking everything else in the forest.
I also remember a two piece device that attached to the end of a spear gun projectile that actually chambered a 5.56mm NATO round.
It was reportedly used by special ops types to improve the chances of dispatching an enemy diver. The round was detonated by direct impact with the target's torso. I imagine it was probably devastatingly effective. but have never seen one used in a movie, or heard about a real-life story where the device was employed.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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