The Forbus Evolution Holster 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. Designed for: FN FNS-40, FN FNS-40 Compact, FN FNS-9, FN FNS-9 Compact.