Looks a bit more like a sex toy.
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It’s .224, but they also came in .30 cal and in 30mm!
Its the worlds worst chamber flag isn’t it?
It is definitely something weird lol
Yeah, a hot chamber… flag!
It was developed in the USA.
…and it comes in duplex and triplex 
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Obviously a lot of Fab acid being passed around in the 60’s & 70’s 
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Is it for a combo gun like a 12G over a 30 cal?
No, it was an experiment in cleaner more complete combustion.
You could almost say it is one of the case less breed of ammo.
.223 calibre
5.56 Folded
Close.
It is a 5.56F something
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Something .38 cal special frangible for air marshal’s?
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Close enough, it is called ThunderZap and was released in .38 and.45 ACP. It is high velocity with little penetration but a high shock round.
Originally designed for home defence so that if you missed your target it would not kill your neighbours.
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Shotgun shell full of small nails works well for that!
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