A Rock Solid Foundation for your original A-Bolt or A-Bolt II. Lightweight, strong and solid. Weaver style bases are the industry standard for hunting rifles. Made from high-quality aircraft grade alloy, these bases will work with most other Weaver-style rings you want to mount on them.Made specifically for your rifle. These scope bases are for the A-Bolt (first series) and the A-Bolt II rifle. They do not fit the AB3 (sometimes called an A-Bolt 3).