Enjoy optical superiority with Weaver 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. 20 MOA cant for extended range optic adjustment.