The Weaver #401S is a one-piece aluminum top-mount scope base intended for factory-drilled Smith & Wesson K, L and N frame revolvers. Each base is machined to tight tolerances to provide a secure platform for Weaver-style rings. The design uses Weaver’s cross-lock concept to maintain ring position under normal use. This base requires a frame that is factory drilled and tapped and typically requires removal of the rear sight for installation; rings are not included.
Key Specifications
- The model/part number is #401S.
- The product type is a 1-piece base.
- The material is listed as ALUM ALLOY.
- The overall dimensions are 1.25 X 2.70 X 4.70.
- The height is 1.2500.
- The width is 2.7000.
- The length is 4.7000.
- The intended fit is S&W K, L, and N frame revolvers (factory drilled).
- The type of rings required is Weaver-style.
- Rings are not included.
This one-piece Weaver base delivers a machined, low-profile platform for mounting Weaver-style rings on compatible, factory-drilled revolvers. Its aluminum construction balances strength and weight for a dependable mounting solution when a secure, factory-fit top mount is required.
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