Weaver Base Top Mount #40am - Extension Aluminum Matte

The Weaver Base Top Mount #40am Extension Aluminum Matte is a precision rifle scope mounting solution designed for shooters who demand a secure, repeatable interface between their optics and firearm. This extension base serves as the foundation for mounting Weaver-compatible rings and scopes, offering the extended reach necessary for rifles with longer receiver distances or specific stock configurations. Whether you're building a precision rifle, upgrading an existing platform, or need a reliable replacement base, the #40am delivers the consistency that competitive shooters and hunters expect.

Constructed from aluminum and finished in matte, this Weaver extension base is machined to tight tolerances that ensure perfect alignment and a custom fit when paired with compatible Weaver rings. The matte finish reduces glare and provides a professional, non-reflective appearance while resisting corrosion in field conditions. The precision machining guarantees maximum strength and holding power—critical for maintaining zero under recoil and in demanding shooting environments. This compact design, weighing only 0.03 lbs, adds negligible weight to your rifle system while maintaining the rigidity required to keep rings from shifting during firing or transport.

The #40am extension base is ideal for shooters using standard Weaver mounting systems on tactical rifles, hunting platforms, or competition builds. Installation requires no gunsmithing—it mounts directly to your rifle's receiver rail using existing Weaver-compatible hardware. This base is compatible with all Weaver-standard rings and optics, making it a versatile choice for scope upgrades or system rebuilds. For those seeking reliable, repeatable accuracy and a proven mounting interface, the Weaver Base Top Mount #40am Extension Aluminum Matte is a dependable choice that won't let you down on the range or in the field.