Leupold Open Range 3/8" Rimfire One-Piece Scope Base - Matte Black - 184809 - UPC 030317039554
Product Description
The Leupold Open Range 3/8" Rimfire One-Piece Base (184809) is a precision-engineered mounting adapter designed to convert standard 3/8" grooved rimfire receivers into a robust, cross-slot mounting platform. Built for rimfire enthusiasts, small-game hunters, and plinkers, this adapter transforms narrow factory dovetail rails into a versatile Picatinny/Weaver-compatible mounting top rail, greatly expanding your optic, ring, and red dot mounting options.
Precision-machined from lightweight, aircraft-grade aluminum, the 184809 Open Range base features severe-duty structural rigidity while adding minimal weight to your receiver. Its one-piece design bridges receiver gaps to ensure true alignment across both mounting points, eliminating ring bind, optic stress, and scope body distortion under field use.
Finished in a durable, non-reflective matte black coating, the Leupold 184809 Open Range Rimfire Base clamps securely onto standard 3/8" dovetail receivers via heavy-duty side locking screws. Designed and made in the USA with Leupold's legendary quality standards, this one-piece adapter base delivers maximum optic placement flexibility and dependable point-of-impact retention for .22 LR, .17 HMR, and .22 WMR rifles.
*Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Fits standard 3/8" grooved dovetail receivers commonly found on rimfire rifles (e.g., Marlin, Savage, Henry, Anschütz, and older Remington/Winchester .22s). Converts 3/8" dovetail rails into a cross-slot Picatinny/Weaver interface. Note: Fits standard 3/8" dovetails; not compatible with 11mm European airgun dovetails or drilled-and-tapped receiver top holes without grooved rails.
- Verify host firearm is completely clear, safe, and unloaded before servicing mounting rails.
- Clean receiver grooved dovetails thoroughly to remove oil, debris, and protective grease.
- Slide or clamp the Open Range 1-piece base onto the 3/8" receiver rail, torque side clamp screws to factory recommended specs (~18–22 in-lbs), and mount your choice of Weaver/Picatinny scope rings or red dot optics.
Key Features
- Dovetail-to-Picatinny Conversion: Adapts standard 3/8" factory grooved rimfire receivers to accept cross-slot Weaver/Picatinny scope rings and red dots.
- One-Piece Alignment Design: Rigid single-piece structure bridges receiver gaps, preventing ring misalignment and optic tube pinch.
- Aircraft-Grade Aluminum Construction: Delivers high structural integrity without adding unnecessary bulk or weight to light rimfire rifles.
- Cross-Slot Mounting Slots: Multiple cross slots provide flexible eye-relief adjustment for various scope tube lengths and compact optics.
- Matte Black Anodized Finish: Non-reflective, glare-reducing protective surface coating resists scratches and corrosion in severe weather.
Product Specifications
- Brand: Leupold
- Model: Open Range 3/8" Rimfire One-Piece Base
- MPN / Part Number: 184809
- UPC: 030317039554
- Base Type: 1-Piece Cross-Slot Base Adapter
- Receiver Fitment: 3/8" Grooved Rimfire Dovetails
- Top Rail Interface: Picatinny / Weaver Cross-Slot Compatible
- Material: Aircraft-Grade Aluminum
- Finish / Color: Matte Black
- Mass: ~2.1 oz (59.5 g)
