The Weaver Top Mount Base #654 (brand part no. 48421) is a front and rear extension scope base machined for the Savage 110 rifle using the 8-40 screw pattern. Where Weaver’s standard two-piece base sets a fixed ring position, the #654’s extension design shifts ring placement to give shooters more room to dial in eye relief on longer or bulkier scopes. Weaver machines it to tight tolerances for a custom fit and uses its Cross-Lock system to hold rings securely.

Key Specifications

• Machined from aluminum for a strong, lightweight base.
• Built as a front and rear extension base for added eye-relief adjustment room.
• Uses the Weaver Cross-Lock design, compatible with Weaver-style top-mount rings.
• Fits the Savage 110 action with the 8-40 screw pattern.
• Finished in matte black.

Frequently Asked Questions

What rifle does this base fit? It is machined specifically for the Savage 110 using 8-40 mounting screws.

How is this different from Weaver’s standard #653 base? The #654 uses an extension design that shifts ring position for extra eye-relief adjustment, rather than a fixed two-piece layout.

Buy the Weaver Top Mount Base #654, Savage 110 (8-40)

If your scope needs extra eye-relief room on a Savage 110, the #654 extension base gives you that flexibility. Order it from Weaver‘s scope bases lineup and our Lubbock, Texas team can help pair it with rings.