I had never heard of this. Found going down the wiki rathole about Personal Defense Weapons.
Instead of the M1 Carbine, which eventually prevailed, support troops would have been armed with a 5 barreled .22 with an insane rate of fire. The development was slow, and not patented until after the war, so who knows if there is even a model extant.
The Neal SMG.
I seem to remember Farmer Frank being leery of full auto .22. Things can go wrong, badly, with rimfire at such a speed. Dangerous to the shooter wrong.
That's a new one on me, too!
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