Brock, if you mean that you have a Weaver 12 Base, you would just need the Weaver Rings in the diameter of the Scope you wish to use. The BSA Scope comes with Weaver Rings already : Example : budsgunshop.com/search.php?q=weaver+rings&type=

You can buy additional mounts for weaver rails on most optics. Check the item description and see what mount it comes with, if you have trouble figuring it out you can always contact the manufacturer or post the questions here in the community and we may be able to figure it out for you.