5.7 MMJ....
The last time I came anywhere NEAR that cartridge was almost 20 years ago, when my ex-fatherinlaw and I were out 4-wheeling and scouting for hunting spots up near Kingman AZ, found a spot where some folks had been doing some shooting out in the desert and a smallish amount of .22/.30 Carbine brass turned up among the empties left behind. (Wish I'd saved one for my "Odditorium" of brass...oh well.)
I can think of one or 2 possible gunsmiths who MIGHT be able to do up a barrel for you, but as to an off-the-shelf rifle......?
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"When the going gets weird, the weird turn pro."--the late Hunter S. Thompson (1937-2005)
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 Thee Mad Reloader (Moderator--Back in Time, Cowboy Action, Outdoor Cooking, Subcalibers)
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