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Old November 29, 2018, 12:41 PM   #1
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11mm or 3/8” Scope Grooves

Are 11mm and 3/8” scope ring grooves the same? Put another way, can I install rings labeled 11mm on 3/8” grooves or vice-versa? I googled it but it started talking about grooves being cut at different angles so I decided to just ask in here so I can get firsthand knowledge. Thanks...
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Old November 29, 2018, 03:04 PM   #2
T. O'Heir
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Nope. 11mm is 7/16". 3/8" is 9.5mm. Mind you, the difference isn't much so they might fit.
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Old November 29, 2018, 03:30 PM   #3
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Warne makes rings that can go either way simply by changing the orientation of the blocks on the bottom of the ring base. There is a difference in size and this comes up with European rifles more than here in the U.S. Example: Anschutz and CZ are 11mm. Warne p.n. is 721 and they come in different heights.
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