These magazines are constructed of a Lexan material, which is an all-black, high-quality military spec approved substance that is used by many European forces. This is the same magazine design that both Pioneer Arms and Interarms provide with their civilian and military contract firearms, with the exception that the Consumer Magazines are produced in our US based facility. The New Gen III design comes with 10, 20, and 30 round witness holes in the rear spine, features the classic Polish waffle pattern, has High strength steel springs for reliable feeding, and are fully user-serviceable with a removable floor-plate for cleaning. Product Features High Strength Steel Springs Lexan Magazine Gen 3 Waffle Pattern Polymer Follower Removeable Floor-Plate Product Specifications Manufacturer: Polish Mfg Model: Gen 3 Caliber: 7.62x39mm Magazine Capacity: 30 rounds