The Polymer MDT AICS External Box Magazines are designed for use with MDT Chassis systems, including the TAC21, ACC, ESS, LSS-xL, xRS and LSS as well as many other M24-type chassis and bottom metals. These detachable magazines are made from high-quality polymer reinforced with a high glass content for superior durability and strength and they feature a tempered steel spring. Each magazine undergoes rigorous testing, including being driven over by cars and trucks without breaking, demonstrating their exceptional toughness and reliability. While not unbreakable, they are built to withstand demanding conditions. MDT AICS magazines are designed for guaranteed compatibility with MDT chassis systems, including XRS, TAC21, LSS, LSS-XL, HS3, ESS and ACC