Getting the best mount starts with a Weaver 2-Piece Top Mount Base. These bases are constructed to provide maximum support for your scope or accessories. These precise and rigid bases fit every Weaver ring and just about all firearms. You can select from either a top or side mount as well as one or two pieces when choosing a Weaver base. For added security and stability, you will find fastening screws that are custom hardened on every base. They are easy to install on your firearm.