Enjoy optical superiority with Weaver'sTactical 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.