XS Sights Long Rail with Ghost Rings Black Ruger GunSite Scout RifleThe XS Long Rail with Ghost Ring upgrades Ruger GunSite Scout rifles to accept an optic. The Long Rail uses factory mounting holes but it extends over the receiver to give you more flexibility in mounting your optic. The rail also features a rear peep sight that works with the factory front sight and is fully adjustable for windage and elevation.