Upgrade your Ruger rimfire pistol for optics-ready performance with the Ruger 1-Piece Weaver-Style Aluminum Scope Base Adapter (90228)—a factory-designed mounting solution built specifically for the Ruger Mark IV, Mark III, Mark II, and 22/45 series pistols. Finished in a durable black anodized coating and machined from lightweight aluminum, this Weaver-style base provides a stable, repeatable platform for mounting compatible optics such as red dots or pistol scopes (ring/mount dependent). Whether you’re setting up a precision plinking rig, a steel challenge-style trainer, or a dedicated rimfire target pistol, the Ruger 90228 (UPC: 736676902286) delivers a clean, reliable way to modernize your Ruger .22 handgun with an optic-ready top rail.
If you’re searching for a Ruger Mark IV scope base, a Ruger 22/45 Weaver rail, or the exact Ruger 90228, this is the correct 1-piece Weaver-style adapter with accurate identifiers for ordering and inventory matching.
Designed for Ruger Mark Series and 22/45: Factory Fit, Clean Installation
Ruger’s Mark series pistols are legendary for accuracy and reliability, but adding optics requires the right mounting interface. This 1-piece scope base adapter is designed to fit:
Ruger Mark IV
Ruger Mark III
Ruger Mark II
Ruger 22/45
A firearm-specific base matters because it supports:
Proper alignment and stable seating on the receiver
A low-profile, clean look that complements the pistol’s lines
Reliable optic retention under repeated shooting
More confidence than “universal” rails that may not fit correctly
Whether you shoot for tight groups or fast steel hits, starting with the right base is the foundation of an optics setup you can trust.
Fit note: Always confirm your exact Mark-series configuration and top-drill pattern compatibility. If your pistol uses a different factory mounting system or a non-standard upper, verify before ordering.
Weaver-Style Interface: Versatile Optic and Ring Compatibility
This Ruger adapter features a Weaver-style rail profile, giving you broad compatibility with many common optics mounting solutions. Weaver-style rails are popular because they support:
A wide range of rings and mounts
Many popular pistol scopes and red dot mounting setups (as applicable)
Flexible placement options to achieve proper eye relief and balance
A proven, straightforward cross-slot clamping system
Whether you’re building a classic pistol-scope target setup or modernizing with a compact dot, a Weaver-style base keeps your options open.
Note: Some mounts are Picatinny-only or have specific slot requirements. Always confirm your rings/mount are compatible with a Weaver-style base.
1-Piece Aluminum Construction: Lightweight Strength for Rimfire Pistols
Made from aluminum, this base is designed to keep weight reasonable while still providing the rigidity needed to hold zero. Aluminum bases are ideal for rimfire pistols because they:
Add minimal weight to the top of the gun
Provide a stable mounting surface for optics
Resist corrosion and stand up to routine handling
Support consistent performance for target shooting and training
On a .22 pistol, maintaining balance matters—this base helps you add capability without making the pistol feel top-heavy.
Black Anodized Finish: Durable, Low-Glare, Factory-Clean Look
The black anodized finish delivers both function and aesthetics:
Corrosion and wear resistance for long-term use
A low-glare appearance that looks at home on Ruger pistols
A clean match with common black optics, rings, and hardware
A professional “factory installed” visual finish
If you want your optic mount to look like it belongs on the pistol—not like an afterthought—this Ruger base is the right choice.
Why Add an Optic to a Ruger Mark or 22/45?
The Ruger Mark-series pistols and 22/45 platforms are already known for accuracy—adding an optic can help you unlock even more capability by improving:
Faster target acquisition for steel and action-style rimfire shooting
Easier precision aiming for small targets and longer distances
Reduced reliance on iron sight visibility (great for aging eyes)
Consistency during drills and training sessions
Whether you prefer a red dot for speed or a scope for precision, a solid base is the essential first step.
Ideal for Target Shooting, Plinking, Training, and Competition
This Ruger 1-piece Weaver-style adapter is a great fit for:
Rimfire target shooters chasing tight groups
Plinkers who want easier hits at varied distances
Steel challenge-style training and fast transitions
Hunters using rimfire pistols where legal and appropriate
Anyone modernizing a Mark II/III/IV or 22/45 with a red dot
A reliable optics mount makes your rimfire pistol more versatile and more enjoyable to shoot.
Why Choose the Ruger 90228 Scope Base Adapter?
Factory Ruger accessories are built with fitment and reliability in mind. The 90228 offers a direct path to optics mounting that’s clean, stable, and designed specifically for the Mark-series and 22/45 family.
Choose it if you want:
A Ruger-made Weaver-style scope base for rimfire pistols
A 1-piece design for stability and alignment
Durable, lightweight aluminum construction
A tough black anodized finish
Compatibility with Mark IV / Mark III / Mark II / 22/45
Clear ordering identifiers: 90228 / UPC 736676902286
Product Details for Easy Identification and Reordering
Brand: Ruger
Product: 1-Piece Weaver-Style Scope Base Adapter
Fits: Mark IV, Mark III, Mark II, and 22/45
Caliber Family: .22 rimfire pistols (platform dependent)
Mount Style: Weaver-Style
Material: Aluminum
Finish/Color: Black Anodized
Part Number: 90228
UPC: 736676902286
If you’re ready to bring modern optic capability to your Ruger rimfire pistol, the Ruger 1-Piece Weaver-Style Aluminum Scope Base Adapter (90228) is the clean, dependable solution. Built for Mark IV, Mark III, Mark II, and 22/45 pistols and finished in durable black anodized aluminum, it provides a stable Weaver-style mounting platform that helps you shoot faster, aim easier, and get more from every range session.
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