Weaver Base Top Mount #402s - Extension Aluminum Silver

The Weaver Base Top Mount #402s Extension Aluminum Silver is a precision mounting solution engineered for shooters who demand reliability and accuracy from their optic systems. This aluminum extension base serves as the foundation for mounting rings and scopes to flat-top or Picatinny rail equipped firearms, making it essential for tactical rifle builds, hunting platforms, and precision shooting applications. The #402s model is specifically designed to extend the height of your optic mounting surface, providing clearance for larger objective lenses or co-witness configurations without compromising structural integrity.

Manufactured to exacting tolerances, the Weaver Base Top Mount #402s delivers the precision fit that discriminating shooters require for consistent zero retention and repeatable performance. The aluminum construction provides an optimal balance of weight reduction and durability, while the silver finish offers corrosion resistance in field conditions. Weaver's machining process ensures maximum strength and minimal play between the base and your mounting rings, preventing the micro-movements that degrade accuracy over time. The compact footprint—measuring 3.4 x 0.95 x 3.8 inches—fits seamlessly into existing setups without adding unnecessary bulk or weight to your rifle platform.

Long-range hunters, tactical shooters, and precision rifle competitors benefit most from the secure mounting foundation this extension base provides. Installation is straightforward on any firearm equipped with Picatinny or Weaver-pattern rails, making it compatible with AR-15s, bolt-action rifles, and most modern tactical platforms. Whether you're building a new optic system or upgrading an existing setup, the Weaver Base Top Mount #402s ensures your rings and scope stay perfectly indexed for shot-after-shot consistency in the field or on the range.