ZERO M-SERIES SLEEVE & MANDREL KIT When Area 419 released the ZERO M-Series Die it changed the way the serious reloader thought about dies and how headspace should work. Along with Area 419's reamer cut sizing chambers, that fully size the case body, the integration of a full-length ground mandrel, and spring loaded decapping, the micrometer adjustability for headspace was unlike ANYTHING on the market. What Area 419 also knew would be a huge deal for reloaders though is the modularity of the dies. Available now are modular sizing sleeves for these dies. NOTE - THESE ARE REPLACEMENT SIZING INSERTS FOR M-SERIES DIES. DO NOT BUY THIS IF YOU DO NOT ALREADY OW Mfg: Area 419