Weaver 99477 Multi-Slot Base Extended – Winchester XPR

The Weaver 99477 Multi-Slot Base is an extended Picatinny-style mounting rail engineered for the Winchester XPR short action. It provides an additional forward inch of mounting real estate to accommodate optics and accessories while maintaining a low-profile, matte finish. Manufactured from aircraft-grade aluminum and treated with a hard coat anodize, this base is intended for rifle receiver mounting and designed for use with Picatinny or Weaver-style rings. Rings are not included.

Key Specifications

• The material is 6061-T6 aluminum for a balance of weight and strength.
• The finish is black matte Type III hard coat anodized for surface protection.
• The application is specified as Winchester XPR short action.
• The mounting style is Picatinny and is compatible with Weaver-style rings.
• The base provides 1 inch of additional forward length for mounting options.
• The product dimension is 0.95 x 3.80 x 10.35 as listed in manufacturer specs.
• The recorded height is 0.9500.
• The recorded width is 3.8000.
• The recorded length is 10.3500.
• Rings are not included; use Picatinny or Weaver-style rings as required.

This extended multi-slot base is a practical, workmanlike solution for shooters who need extra mounting space on a Winchester XPR short action. Its durable aluminum construction and hard coat anodized finish deliver dependable performance without excess weight, making it a straightforward choice for rifles where precise, repeatable scope placement matters.