So Kel-Tec's wizards spent who knows how long designing a recoil mechanism that switches between blowback and locked breach; how the system works we have no idea but it's presumably magic, and we're sticking with that.
But unfortunately they were so happy with their hybridized recoil system that they sorta forgot to do some ballistics testing, since the PMR-30 keyholes ammo.Yep, the 4.3" barrel has a 1:16 twist that's just patently not aggressive enough and and doesn't fully stabilize lighter-weight ammo, and they're reducing it to either 1:9 or 1:12 (the testing is currently under weigh).
The worst part about this is that Kel-Tec's finally gotten to a point in production where they can keep up with demand, and so this means a whole lot of guns got out already.