Weaver 63BS Top Mount Base — Silver (Marlin 336, Mossberg 640)

The Weaver 63BS is a one-piece top-mount scope base engineered for secure optic attachment on compatible rifle receivers. Machined to tight tolerances from aluminum and finished in silver matte, it provides a stable platform for Weaver-style rings. Rings are not included; this base is designed to pair with detachable Weaver rings.

Key Specifications

• The material is ALUMINUM for a balance of strength and light weight.
• The finish is SILVER MATTE.
• The model number is 63B-S.
• The listed application is #63B.
• The dimensions are 0.50 x 3.25 x 8.40.
• The height is 0.5000.
• The type of rings needed is WEAVER STYLE.
• Rings included: No.
• Pieces: 1 (one-piece base).
• The elevation is 0 MOA.

This one-piece Weaver base delivers a straightforward, durable mounting solution for shooters who need a rigid, repeatable platform for their optics. Its machined fit and Weaver cross-lock design make it suitable for field and range setups where dependable alignment and minimal fuss are priorities.