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What size screw fits in a rifle scope mount hole?

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The industry standard for scope mounts is the 6-48 screw. This is an oddball size due to the fact that it is only used for that application. Brownells is one source for such screws and related tooling. Larger magnum builders have opted for the 8-40 size, however, to stand up better to the rigors of the magnum recoil.
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