Crucial Concealment Covert IWB Inside Waistband Holster, Ambidextrous, Kydex, Black, Universal Fit for Surefire X300 A/B Ultra/Turbo 1401 The Universal Light Holster represents an exciting evolution in light compatible holsters for Crucial Concealment. Leveraging the adjustable retention shim" this holster can accommodate a variety of 9mm or .40 pistols" provided that it is equipped with the SKU specific weapon light on the pistol. This holster simplifies weapon light ownership for both dealers and end-users. One holster for the X300 now functions with the most popular pistols (Glock 19" P320 C" VP9 Staccato" etc.).