Leupold 182846 BackCountry Cross-Slot Base Nosler M21 Matte Black

The Leupold BackCountry Cross-Slot Base delivers a rock-solid mounting platform specifically engineered for Nosler M21 rifles. This precision-machined base transforms standard hunting rifles into long-range capable systems by providing multiple mounting positions for optimal scope placement.

What Makes This Different

Unlike traditional fixed bases, the BackCountry Cross-Slot system features multiple cross-slots that allow fore and aft scope positioning adjustments. The 7075-T6 aluminum construction weighs 40% less than comparable steel bases while maintaining identical strength ratings. Each base undergoes CNC machining to achieve +/- 0.001" tolerances, ensuring perfect alignment between mounting surfaces.

Key Features

• 7075-T6 aluminum construction with Type III hard anodizing for corrosion resistance
• Cross-slot design allows 2 inches of scope positioning adjustment
• Precision-machined to +/- 0.001" tolerances for perfect ring alignment
• Matte black finish reduces glare and blends with rifle aesthetics
• Compatible with Leupold PRW2 and Mark 4 ring systems
• Torque specifications clearly marked for proper installation
• Fits Nosler M21 rifle action mounting holes perfectly

Field performance relies on consistent scope return-to-zero after transport and handling. The BackCountry base maintains scope alignment through temperature extremes from -40°F to 160°F. Hunters report maintained zero accuracy after thousands of miles of vehicle transport across rough terrain. The cross-slot system accommodates different scope lengths while maintaining proper eye relief for magnum cartridges.

Technical Specs

• Material: 7075-T6 aluminum alloy
• Finish: Type III hard anodized matte black
• Weight: 3.2 ounces
• Length: 5.75 inches
• Height: 0.43 inches above receiver
• Compatibility: Nosler M21 rifle actions
• Ring compatibility: 30mm and 1-inch tube diameters
• Torque specification: 25 inch-pounds
• Country of origin: USA
• Warranty: Leupold Golden Ring lifetime guarantee

Professional gunsmiths choose Leupold bases for their dimensional consistency and long-term reliability. The BackCountry series represents decades of mounting system refinement combined with modern manufacturing precision. This base transforms the Nosler M21 into a platform capable of supporting premium optics for extended hunting seasons.