Shop › MAG RUGER-57 5.7X28MM 20RD STL MAG RUGER-57 5.7X28MM 20RD STL $53.95 Ruger Magazine, 5.7X28MM, 20 Rounds, Fits Ruger-57, Steel, Black 90700 Quantity: Add To Cart Added! Ruger Magazine, 5.7X28MM, 20 Rounds, Fits Ruger-57, Steel, Black 90700