Weaver Extended Multi-Slot Base 99476 — Winchester XPR LA

The Weaver Extended Multi-Slot Base (model 99476) is a one-piece Picatinny-style mounting base designed for the Winchester XPR long action. It provides an additional one inch of forward length to expand optic placement options and accommodate longer scopes or accessories. Manufactured from aircraft-grade 6061-T6 aluminum and finished with a matte Type III hard coat anodize, the base is compatible with Picatinny or Weaver-style rings.

Key Specifications

• The application is Winchester XPR (Long Action).
• The mount style is Picatinny.
• The base provides an additional forward length of 1 inch for mounting flexibility.
• The material is 6061-T6 aluminum.
• The finish is a matte Type III hard coat anodized surface.
• The base accepts Picatinny or Weaver-style rings.
• Rings included: No.
• Dimensions are listed as 0.90 x 3.50 x 10.30.
• Height is 0.9000, width is 3.5000, and length is 10.3000.
• Weight is listed as .2 (unit not specified in source data).

Designed for practical optic placement and repeatable alignment, the Weaver 99476 extended base adds usable forward rail while maintaining a low-profile, one-piece footprint. Its machined 6061-T6 construction and hard-coat anodize provide durable surface protection for regular field use. Offered in standard zero cant and available in 20 MOA cant for additional elevation correction, this base expands mounting options for shooters who require precise, stable optic positioning.