Description
The Leupold Open Range Rimfire Cross-Slot Base is one of those simple upgrades that makes a big difference on a rimfire rifle. It clamps onto the 11mm or 3/8" dovetail grooves found on most .22 rifles and gives you a proper cross-slot (Weaver-style) rail to work from. That means instead of being stuck hunting for the right dovetail rings, you can run just about any cross-slot ring set you already own or want to pick up.
Why the Open Range Rimfire Base Earns Its Spot
Leupold machines this base from aircraft-grade aluminum, so it keeps things light without feeling flimsy. It's a true one-piece design, which cuts down on the flex and alignment headaches you sometimes get with two-piece setups. The low center height of .56" keeps your optic sitting close to the bore, and the no-tap, no-drill installation means you can have it mounted in a few minutes with basic tools.
Getting the Open Range Base Dialed In
Since this accepts any size cross-slot rings, it plays nice with 1-inch and 30mm scopes alike once you pair it with the matching rings. The milled rail gives your rings a positive bite, and snugging the keeper screws to spec keeps everything locked down through plenty of range sessions. It's a clean way to set up a rimfire for small game, plinking, or working on fundamentals with a trainer.
Leupold builds its mounts to the same standards as its scopes, and that shows up in the fit and finish here. The matte black finish shrugs off the usual wear that comes with a rifle that actually gets used, and it's made in the USA. For anyone tired of fighting factory dovetail mounts, this base is a straightforward fix that gives you far more ring options down the road.
Key Specifications
- Manufacturer: Leupold
- Model: Open Range Rimfire Cross-Slot Base
- Manufacturer Part Number: 184809
- UPC: 030317039554
- Material: Aircraft-grade aluminum
- Finish: Matte Black
- Base Configuration: 1 Piece
- Mount Type: 11mm / 3/8" Dovetail to Cross-Slot (Weaver Style)
- Ring Compatibility: Any size cross-slot rings
- Base Cant: No
- Center Height: .56 in
- Keeper Clamp Torque: 28 in-lbs
- Weight: 2.6 oz
- Country of Origin: Made in USA
What’s Included
- Leupold Open Range Rimfire Cross-Slot Base (1 piece)
- Mounting hardware
Frequently Asked Questions
What rifles does the Open Range Rimfire base fit?
It's built for most .22 rimfire rifles that have 11mm or 3/8" dovetail grooves machined into the receiver. That covers a wide range of popular rimfire platforms. It clamps onto the dovetail, so there's no tapping or drilling required.
Does this base come with rings?
No, this is the base only. It gives you a cross-slot (Weaver-style) rail, and you'll add your own cross-slot rings to match your scope. The nice part is it accepts any size cross-slot rings, so you're free to run 1-inch or 30mm optics once you pair the right rings.
How hard is it to install the Open Range Rimfire base?
It's a straightforward job. Because it clamps onto the existing dovetail, you don't need to drill or tap anything. Snug the keeper screws to the recommended 28 in-lbs and you're set.
Is the base canted for long-range shooting?
No, this base has zero cant built in. It's a flat, low-profile setup designed for general rimfire use like plinking, small game, and training. If you want extra elevation for distance work, you'd want to address that through your rings or scope adjustment.





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