Weaver #40A Top Mount Scope Base – Aluminum, Black

The Weaver #40A is a one-piece top-mount scope base produced in black aluminum. It provides the Weaver cross-lock interface intended for use with Weaver-style detachable rings and is machined to tight tolerances. The base is listed to fit a range of receivers including Remington 700, Ruger M77 and Weatherby Mark V patterns.

Key Specifications

• Constructed from ALUMINUM.
• Finished in BLACK GLOSS.
• This is a 1-Piece top mount base.
• No rings are included with the base.
• Requires WEAVER STYLE rings.
• Overall dimensions: 0.85 x 1.65 x 3.50 (manufacturer data).
• Height is listed as 0.8500.
• Width is listed as 1.6500.
• Length is listed as 3.5000.
• Elevation is specified as 0 MOA.

Designed for practical use in hunting and precision shooting setups, the Weaver #40A delivers a stable, recoil-resistant platform for Weaver-style rings. Its one-piece aluminum construction and precise machining provide consistent alignment and durable performance for compatible bolt-action receivers and similar platforms.