ProMag Industries Drum Magazine, 9MM, 50 Rounds, Polymer, Black, *Does not fit Glock Pistols, for use in PCC / 9mm AR-15 using Glock type magazines only DRM-A12 ProMag magazines are made in the USA and backed by a lifetime guarantee against manufacturer's defects. Magazine springs are precision wound using heat-treated chrome silicon wire and each and every step of the assembly process is checked and double checked in order to maintain the same consistent level of quality.