In testing conducted by Passaic County, New Jersey Sheriff's Department, the 5.7×28mm SS190 penetrated to a depth of in bare ballistic gelatin, and a depth of in gelatin protected with a Kevlar vest [REF].
The Five-seven pistol feeds from detachable box magazines, but it is unconventional in that it feeds cartridges into the chamber without the use of a barrel feed ramp, having a beveled chamber only-the pistol's feeding is inherently reliable because of its use of bottlenecked cartridges [REF].