Due to customer demand for a way to use the popular serpa retention holster as a shoulder rig, BLACKHAWK! developed this comfortable shoulder harness platform. Made with a tapered web harness that adjusts for size and an offside dual Picatinny rail platform for any Picatinny rail system accessory. The CQC serpa shoulder harness allows you to mount your serpa holster on the underarm platform in a horizontal position for secure carry and natural drawing motion. This system enables one handed reholstering..