ProMag Industries Magazine, Drum, 5.7X28MM, 55 Rounds, Fits FN Five-seveN USG 5.7x28mm pistol, Polymer Construction, Flat Dark Earth DRM-A76-FDE 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.