These optic spacers are used to separate optics within an SM05 or SM1 lens tube. As an alternative to using a plastic retaining ring, a spacer may be used to prevent direct contact between an anodized aluminum retaining ring and the optic
Assembling of lenses and spacers on the V-cave of the optical bench.
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Imgur: The magic of the Internet
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Weapon Outfitters KRAM 5.5番 Trijicon ACOG用 スペーサー Optic
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Weapon Outfitters Homepage Weapon Outfitters KRAM Optic Spacer - ACOG Pattern WO Home
Thoughts on the KRAM spacer. It definitely helps with eye relief and optic height. : r/tacticalgear
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