The matte black Grand Slam Steel Top Mount Base #S45 from Weaver has been machined to tight tolerances for a custom fit. A square-cut notch mates to the sturdy cross bolt in every Weaver top mount ring.
Standard Front Base for:
Note: For the Mauser Receiver Ring with a 1.4" diameter (98FN) shimming is probably required for perfect scope alignment. The rear base may require modifications for correct fit to military actions.