I second this and add it is a very lite weight pistol. Love it.I've got a Ruger 57 and love it. Very nice shooting gun with almost no recoil.
It will penetrate some, but not all.My CHL instructor bought a 5.7 because he claimed it would penetrate a bullet resistant vest. He wanted one due to the cartel activity out here.
I was told a 22 mag would also….guess it depends on the level of vest.It will penetrate some, but not all.