KelTec P50 5.7x28mm "Nutcracker"

KelTec was at SHOT Show 2022 showing off their P50 "Nutcracker" chambered in 5.7x28mm. For $300, you can add a carbine kit that includes a fairly legit side-folding stock and a 16-inch barrel that is NFA compliant so long as you install both pieces. If you want to file the Form 1 and just install the stock, that's you.