Each Weaver base is machined to the tightest tolerances for a custom fit. They are designed to fight the effects of recoil with a square-cut notch that precisely mates to the sturdy cross bolt in every Weaver detachable ring.
For the Browning 52, 52C, and A-Bolt (European Style) the front base screws must be shortened by grinding
For the Ruger #1 and #3 the gun will need to be drilled and tapped. Shimming is probably required for perfect scope
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