Mossberg 500 590 Receiver Picatinny Rail Scope Mount for mounting Optics or laser sights to your Mossberg 500 590 Shotguns. Low Profile Picatinny Rail mount design with See-Through Channel allows you to still use the Front Bead Sight. Screws included for mounting rail to Shotgun Receiver. All Aluminum Construction. Black Anodized finish. Length: 5.4" Rail is designed to fit Mossberg 500/590 models with the factory pre-drilled holes on top of the shotgun receiver. Screws included for mounting rail. Picatinny rail mount for Mossberg 500 and 590 Series and equivalent shotguns Allows for the mounting of Picatinny or Weaver standard scopes, red dots, magnifiers, or other optics Installs via included set screws into the Mossberg factory mounting holes Crafted from lightweight aluminum, 5.4 inches in length and 1.4 ounces in weight