One-piece picatinny scope base is designed for use with ruger american rimfire rifles chambered in.22 lr.This 0 moa rail is engineered specifically to fit the american rimfire factory scope mount holes on the gun's receiver.Mil-std picatinny slot-and-rail spacing accepts picatinny or weaver scope rings.One-piece design is precision-machined from billet aluminum.Base is 6" long with a hardcoat anodized finish and includes (4) torx mounting screws and a t-10 wrench.Note: this scope base does not fit the 10/22 rifle.Made in the usa.Genuine ruger factory accessory.Length: 6.0"Model: Ruger American Rimfire Picatinny Scope Base RailStyle: Picatinny/WeaverFinish: Hardcoat AnodizedMaterial: AluminumPieces: 1Gun Type: RifleMount Type: To ReceiverRings Included: No