The Weaver Top Mount #63B 1-Piece Scope Base (Weaver part no. 48069) is cross-referenced for select Marlin and Mossberg rifles, giving hunters a solid, tight-tolerance mount for a rimfire or centerfire optic. Weaver machines every base to hold rings without play, so zero stays put through repeated shots at the range or in the field. Confirm the #63B application against your specific model before ordering, since Weaver’s application chart covers more than one action type under this number.

Key Specifications

• Machined as a 1-piece base for a fixed, repeatable mounting platform.
• Cross-referenced to Weaver’s #63B application code for select Marlin and Mossberg rifles.
• Built from aluminum for a strong, lightweight mount.
• Finished in black gloss to match most factory rifle finishes.
• Designed around Weaver-style rings, which fit the base’s cross slots.
• Rings are not included and must be ordered separately.
• Mounts directly to the receiver, keeping the sight line low.
• Weighs about 0.1 lb, adding negligible bulk to the rifle.

Frequently Asked Questions

Does this fit every Marlin and Mossberg model? It is cross-referenced to the #63B application code for select Marlin and Mossberg models — confirm your exact model against Weaver’s application chart before ordering.

Does this base include rings? No, rings are sold separately — it is designed around Weaver-style rings.

What is the base made of? Aluminum with a black gloss finish for a durable, factory-matched look.

Buy the Weaver Top Mount #63B Scope Base

Order this base from our scope base selection to get your Marlin or Mossberg optic-ready with a mount built to Weaver’s tolerances. Order it from our Lubbock, Texas gun shop for fast, insured shipping.