The Ruger Scope Base Set for No. 1 Varminter and No. 3 Rifles (Ruger part no. 90004) is the genuine factory scope base adapter built specifically for these two single-shot rifle actions. Finished in black steel, this two-piece base set gives shooters a proper mounting surface for standard scope rings without modifying the receiver. It’s the right call for anyone restoring a No. 1 Varminter or No. 3 to shooting condition, or simply adding glass to a rifle that never had a scope. Because Ruger builds it to their own receiver tolerances, fitment is exact. See more from Ruger / Sturm, Ruger & Co. at our shop.

Key Specifications

• The base ships as a 2-piece style set, matching the traditional dual-base scope mounting layout.
• Construction is black steel, chosen for long-term strength under recoil.
• It functions as a scope base adapter, giving standard ring mounts a proper interface on this receiver.
• Mounting is direct to the receiver, using the rifle’s existing factory-drilled holes.
• The set is sold as one unit per box, containing everything needed for a single rifle.

Frequently Asked Questions

Will this fit a Ruger No. 1B rifle? No. Ruger specifies this base set for the No. 1 Varminter and No. 3 rifles only; it does not fit the No. 1B.

Is this a genuine Ruger part? Yes, it’s a factory Ruger scope base built to the exact hole spacing of these receivers.

What ring style does this base accept? It’s a standard 2-piece scope base pattern, so it accepts the corresponding two-piece scope rings sized for that base spacing.

Buy the Ruger Scope Base Set for No. 1 Varminter and No. 3 Rifles

Don’t force a universal base onto a receiver it wasn’t cut for — get the factory-correct fit. Order it from our Lubbock, Texas gun shop for fast, insured direct shipping. Browse our full Scope Accessories & Scope Parts selection for more options.