Weaver's 1-Piece Extended Multi-Slot Base comes in a black anodized finish. The base provides for an additional 1 inch of length forward to allow for more mounting options and is constructed from 6061-T6 aluminum to allow for the most strength and durability. The base is multi-slotted and compatible with either Weaver or Picatinny-style rings. No strip, no slip Torx screws and an integrated recoil lug add to the features on this tactical piece. The solid build allows for extended optics with your firearm.