Talley's Picatinny Base is constructed of 7075-T6 aluminum with matte black finish and has a 20 MOA. This model is compatible with Remington 700 song action rifles that use 8-40 screws.Scope ring bases talley scope ring bases are machined from solid bar stock. The double recoil shoulder design of the talley base holds your scope with absolute rigidity under severe recoil. The base is checked and rechecked by our quality control manager. Features: The Talley guarantee nothing is tougher than a Talley