Smith & Wesson Magazine, 9MM, 17 Rounds, Fits S&W CSX-E Series, Black 14456 The CSX E-Series is built with purpose-delivering superior ergonomics and control in a compact, metal-framed package. One of the standout enhancements is the large wrap-around front strap, increasing the textured surface area by 200% compared to the original CSX. This means better grip, better control, and more confidence every time you draw.