Nobody currently mfgs firearms for the 5mm (according to Wikipedia, only Remington and TC ever mfg firearms for it). It kinda got eclipsed by the 17 rimfire craze. There was a company who was converting the 591 and 592 Remingtons to a centerfire round so those with orphaned guns could shoot them, but Aguila has been making ammo for them since 2008.
True, I was speaking more in terms of the possibility of it ever being reintroduced. Aguila only started making ammo for it again because Taurus was going to make a gun to match, but never did.
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