MDT Magazine, 223 Remington, 12 Rounds, Fits Short Action AICS Pattern, Polymer Construction, Black 106541-BLK MDT polymer magazines are quiet, reliable, and easy to maintain, letting you focus on what matters, taking the shot. These detachable AICS box magazines are designed to fit the MDT TAC21, ACC, ESS, LSS-XL, XRS, HNT26, LSS Chassis systems, and many other M24 type chassis and bottom metals.