Tactical Solutions Scope Base for 10/22 Standard. 10/22 Scope Rails are perfect for mounting your optics on your 10/22. Picatinny rail allows the use of Picatinny or Weaver style scope rings. Both measure is 4.6 inches. Machined from solid billet of 6061-T6 aluminum and has a durable hard Black anodized finish. ~Tactical Solutions standard scope base fits Ruger 10/22 receivers using factory screw holes for easy and secure mounting.