Shop › MAG RUGER-57 5.7X28MM 20RD STL 2PK MAG RUGER-57 5.7X28MM 20RD STL 2PK $85.95 Ruger Magazine, 5.7X28MM, 20 Rounds, Fits Ruger-57, Steel, Black, 2 Pack 90711 Add To Cart Added! Ruger Magazine, 5.7X28MM, 20 Rounds, Fits Ruger-57, Steel, Black, 2 Pack 90711