HEXMAG Magazine, Series 2, 223 Rem/556NATO, 10 Round Capacity, 30 Round Body Size, Fits AR-15, Polymer, Black HX1030-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.