The XS Sight Systems Shot Rail and Rear Sight with Banded Standard Dot Tritium Front comes with a Picatinny rail ghost ring rear sight and a banded standard dot Tritium front sight. It is designed for Mossberg 500 590 930 Shotguns. The rear rail is constructed from anodized aluminum and is compatible with Weaver or Picatinny rings & mounts. Rail is pre-drilled for standard Remington or Mossberg receivers. Ghost ring rear sight is precision machined from stress proof steel. Rear sight allows for windage and elevation adjustment. Banded front sight contains a standard Tritium dot front sight post for high visibility in all lighting conditions. Easy installation requires no gunsmithing. Fits on barrels that do not have a front sight base or sight rib. Fits: Mossberg 500/590/930 Shotguns