Shop › MAG RUGER SR-556 556NATO 5RD BLD MAG RUGER SR-556 556NATO 5RD BLD $26.95 Ruger Magazine, 556NATO, 5 Rounds, Fits SR-556, Steel, Blued Finish 90428 Quantity: Add To Cart Added! Ruger Magazine, 556NATO, 5 Rounds, Fits SR-556, Steel, Blued Finish 90428