The Ruger Weaver-Style Scope Base Adapter (brand part no. 90224) is a factory base built to fit the Ruger Mark I, Mark II, Mark III, and 22/45 rimfire pistols. It measures 4.5 inches long and converts the pistol’s receiver to a standard Weaver-style rail, opening up mounting compatibility with the wide world of Weaver scope rings rather than Ruger’s proprietary ring system. Ruger machines the base from aluminum and finishes it in a clear anodized silver to match the pistol’s factory finish. Because it does not accept Ruger’s own scope rings, buyers need a set of Weaver-style rings to complete the mount, sold separately.

Key Specifications

• Ruger Mark I/II/III and 22/45 Fit is a factory fit for these Ruger rimfire pistols.
• 4.5-Inch Base Length spans the receiver for a solid, secure mount.
• Weaver-Style Rail Conversion replaces Ruger’s proprietary mount with an industry-standard Weaver pattern.
• Aluminum Construction keeps the base lightweight on the front of a rimfire pistol.
• Clear Anodized Silver Finish matches the factory pistol finish.
• Requires Separate Weaver-Style Rings since it does not accept Ruger’s proprietary scope rings.
• Single-Piece Base Design ships as one adapter with no rings included.
• Does Not Fit Ruger Scope Rings so plan on a Weaver-style ring purchase.
• Genuine Ruger Factory Part is manufactured by Ruger for its own rimfire pistols.

Frequently Asked Questions

What pistols does this base fit? The Ruger Mark I, Mark II, Mark III, and 22/45.

Does it accept Ruger scope rings? No, it requires Weaver-style rings, sold separately.

How long is the base? 4.5 inches.

Buy the Ruger Weaver-Style Scope Base Adapter

Mount a scope on your Ruger rimfire pistol with this factory Weaver-style base adapter from our scope bases selection. Order online and we will ship it straight to your door from our Lubbock, Texas gun shop.