This is a Raven Concealment Systems Holster known as the Perun, model PXG19.
The Perun is their flagship outside-the-waistband (OWB) holster. It is the result of blending the best features of two of their most popular holsters" the Eidolon and the Phantom" to create a highly refined" exceptionally concealable holster.
Features:
Fits Glock 19/23/32
Outside the waistband holster