The Weaver Top Mount #63BS 1-Piece Scope Base (Weaver part no. 48447) is cross-referenced for the Marlin 36 and 336 along with the Mossberg 640, giving a matching silver-finish mount for rifles with bright metal receivers. Weaver machines every base to hold rings without play, so zero stays put through repeated shots. Confirm the #63BS 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 the Marlin 36, 336, and Mossberg 640.
• Built from aluminum for a strong, lightweight mount.
• Finished in silver matte to match bright metal receivers.
• 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 the Marlin 36, 336, and Mossberg 640 — confirm your exact model against Weaver’s application chart before ordering.

Why is this base silver instead of black? It is finished in silver matte to match rifles with bright metal receivers.

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

Buy the Weaver Top Mount #63BS Scope Base

Order this base from our scope base selection to get your bright-finish Marlin or Mossberg optic-ready. Order it from our Lubbock, Texas gun shop for fast, insured shipping.