Weaver Base Top Mount #421m - Aluminum Matte

The Weaver Base Top Mount #421M Aluminum Matte is a precision scope mounting base engineered for shooters who demand rock-solid optic stability on their rifles. This top mount base serves as the critical interface between your firearm's receiver and riflescope rings, ensuring your optic stays zeroed under recoil and field use. Whether you're building a hunting rifle, precision shooting platform, or tactical configuration, this Weaver base provides the foundation for reliable long-range accuracy.

Manufactured from aluminum and finished in matte to eliminate glare and blend with modern rifle aesthetics, the #421M base is machined to tight tolerances that guarantee a custom fit with minimal play. The matte surface treatment reduces light reflection, critical for tactical and hunting applications where glint could compromise position. Maximum strength engineering allows scope rings to clamp securely without shifting, maintaining zero integrity across extended shooting sessions. The compact profile (3.35 x 0.8 x 3.7 inches) and lightweight construction (0.05 lbs) add negligible weight while preserving the structural rigidity required for magnum and high-recoil calibers.

This Weaver mount base is ideal for gunsmith installations, rifle builds, and shooters upgrading to precision optics on platforms already drilled and tapped for Weaver-compatible bases. The aluminum construction balances durability with weight savings—essential for hunters carrying rifles over long distances or tactical shooters requiring modular configurations. Installation requires matching compatible Weaver rings and proper torque specification per your rifle manufacturer's guidelines. Confirm your receiver drilling pattern matches Weaver #421M specifications before purchase to ensure flawless fit and optimal performance.