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Each Weaver base is machined to tight tolerances for a custom fit. These aluminum bases offer maximum strength for rings to hold tight. Enjoy optical superiority with our Tactical Multi-Slot Bases. These Picatinny bases are designed for specific models of firearms and provide an additional 1 inch of forward length for more mounting options. Manufactured from 6061-T6 aluminum and protected by a matte, Type III hard coat anodized finish, these multi-slot bases are compatible with Picatinny or Weaver style rings. Available with 20 MOA cant for extended range optic adjustment as well as standard zero cant.