HEXMAG Magazine, Series 2, 223 Remington/556NATO, 15 Rounds, Fits AR Rifles, Polymer, Black HX1530-AR15S2-BLK The next evolution in AR15 magazines is here - the SENTRY Hexmag featuring the iconic Hexture design pattern. Enhancements make this the most compatible" user-friendly magazine on the market" while SENTRY's proprietary PolyHex2 Advanced Composite delivers superior strength and reliable performance for lifetime usability.