The XS Sights Shotail comes with a Picatinny rail, ghost ring rear sight and a banded standard dot Tritium front sight. 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 sigth is precsion 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. Mfg: Xs Sight Systems SPECS: Fits – Remington 870 or Mossberg 500/590/930. Construction – steel and aluminum. Drop-in installation. Front sight fits on barrels without a front sight post or sight rib.