Leupold Nosler M21 BackCountry Cross-Slot Base Short Action 20 MOA Black. This cross-slot is specifically designed to fit a Nosler M21. The BackCountry series is one of our lightest and most rugged hunting-style mounts yet. The Backcountry cross-slot mount features a 1-piece Picatinny rail base while the low-profile rings will fit both Picatinny and Weaver-style bases. Nothing is more crucial than the link between your scope and firearm. Thats why our mounts are every bit as rugged and dependable as the Leupold optics they secure. And with a huge variety of mounting systems to pick from you're sure to find the perfect match for your firearm and style of shooting. made in specialized factories and guaranteed to hold up to a lifetime of abuse Leupold mounts will never let you down. Specifications for Leupold Nosler M21 BackCountry Cross-Slot Base: Manufacturer: Leupold Color: Black Fabric/Material: 7075-T6 Aluminum Quantity: 1 Fit: Nosler M21 Gun Rail: Picatinny Features of Leupold Nosler M21 BackCountry Cross-Slot Base The Backcountry cross-slot mount features a 1-piece Picatinny rail base while the low-profile rings will fit both Picatinny and Weaver-style bases. Package Contents: Leupold Nosler M21 BackCountry Cross-Slot Base Leupold 182848: Nosler M21 BackCountry Cross-Slot Short Action 20 MOA Black