This is a Sticky pocket holster for single stack sub-compact firearms. This holster is manufactured by Stick Holsters and is their MD4 model.
Fits:
Beretta - PX4 Storm Sub-Compact
Glock - 43
Kahr - P9, P40, P45, C9, C40, C45
Ruger - SR9c, SR22, SR40c
Smith & Wesson - Shield 9mm, Shield 40sw
Walther - PPS 9mm, PPS 40sw