Blackhawk Serpa Concealment Holster, Carbon Fiber, LH, Caracal F - 410043BK-L.p The Blackhawk CF SERPA CQC Holster gives you the most advanced material available for a holster, with a tension-adjustable passive retention system that allows you to select the amount of retention on you gun. The system uses a screw-adjustable detent that grabs the trigger guard of your pistol. The speed cut allows for fast draw and easy reholstering.