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. Fits: CZ 97B Smith & Wesson M&P Shield 9mm & .40 Taurus Slim 708 Taurus Slim 709 Taurus Slim 740 Walther PPS 9mm & .40