About Standard Scope Rings
Modern scope rings typically fit onto a Weaver or Picatinny rail, and come in either 30mm or 1" diameter. However, some specialty scopes are available in 34mm or 35mm sizes.
Older scope rings were frequently rifle-specific.
This article is more or less a stub, before I get around to writing a more detailed article.
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SeanNewton - 11 Dec 2007