has a new pistol for 2021 that's chambered in 5.7x28 mm, the P50 ... At the core of the Kel-Tec P50 is an inverted FN PS90 50-round magazine, from which the P50 earns its name.

Depending on your point of view, Ruger is either a very early or rather late adopter of the 5.7x28 mm FN cartridge ... elect to carry over the 20-round steel magazines developed for its handgun.