I fail to see how a cartridge that has existed since 1990 is "new". For the mathematically impaired, that is 23 years old. Regardless, the current shortage is caused by the increased popularity of the round and the guns that shoot it. The supply just needs to catch up with the demand, just as the 380ACP shortage did 4 years ago.
It never will unless someone else then FN makes it, Only FN makes the casings.
It takes a heck of a lot less time to dust off unused 380ACP tooling, then to lay out money to design new 5.7 tooling for a round that only works in expensive firearms.
Even Privi Partizan doesn't make it, and they make rounds for just about everything.
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