The EGW Winchester Pre-'64 Model 70 long action Picatinny scope base adds the versatility of a one-piece Picatinny scope rail to your rifle with no drilling or tapping. Machined from ultra-rigid, extruded 6061 T6 aluminum with Picatinny slot-and-rail spacing that allows fast and simple changes to eye relief, plus great flexibility in scope choice. Configured with a milled-out center channel for weight reduction without sacrificing strength. Full-width cross-slots are gauged to MIL-STD 1913 Picatinny specs to +/-.002". Built-in 20 MOA of elevation Drilled to fit factory scope mount holes on receiver Includes socket head TorxA(R) screws and wrench EGW r Mfg: Egw