Army Navy Gear's Fobus Evolution Holster Fits Glock is an excellent choice for a passive retention holster. This holster fits a wide variety of guns and will give you years of use.
This product has the following fits:
Glock 17, 19, 22, 23, 31, 32, 34, 35
Kahr CW40, P45, P40, PM40, CM40
GUN NOT INCLUDED
The Evolution Series is a passive retention holster that includes a retention adjustment screw. The tension screw is not pre-set and allows for retention pressure to be adjusted based upon personal preference. When un-holstering, do so in a deliberate and rapid upward motion. Passive retention is automatically engaged upon re-holstering.