Leupold BackCountry one piece cross-slot scope bases are made from high quality 7075-T6 aluminum and they feature a hard coat anodized matte black finish. Each mount is compatible with either Weaver or Picatinny style rings. Each base is painstakingly designed by the Leupold engineers to fit a very specific set of receiver types. Please see below for the fitment guidelines.

Specifications and Features:
Leupold BackCountry 1-Piece Cross-Slot Scope Base 171343
Weaver/Picatinny Compatible
One Piece Base
20 MOA Elevation Bias Built In
7075-T6 Aluminum
Hard Coat Anodized
Matte Black

Fits:
Winchester Model 70 Post 64 Long Action Calibers/Receivers