Mec 600 Jr Mark V Die Set 20 Gauge. OpticsPlanet is an Authorized US Distributor for Mec Reloading Equipment. The MEC Jr Mark V Conversion Die Set Conversion Kits feature the most up to date manufacturing techniques. The company invested heavily in the development of a better manufacturing process and equipment to support the creation of a better product. The engineers at MEC continually seek new ways to improve the functionality of their shotshell reloading presses and equipment. One of the most successful companies to provide this type of equipment is MEC. Their patented equipment and trademarks such as the MEC Mark V and 600 Jr. Shotshell Reloading Presses are just a few of the many items manufactured by MEC. Specifications for Mec 600 Jr Mark V Die Set 20 Gauge 845220: Gauge: 20 Package Contents: Mec 845220 600 Jr Mark V Die Set 20 Gauge We offer the complete line of Mec Reloading Equipment. For our complete selection of products by MEC on sale please visit our MEC page. For more Reloading Equipment please visit our Reloading Equipment store section.