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Looking for knurled nut for Gunnar adapter

It was great that Benjamin provides a barrel adapter with their Gunnar, however they do not include the knurled nut and I am having a hard time finding one. Nothing comes up specifically for the Gunnar, but I'm hoping maybe another gun might use the same size? The knurl nut would be roughly 28mm wide, and 12mm tall. Any ideas?

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It was great that Benjamin provides a barrel adapter with their Gunnar, however they do not include the knurled nut and I am having a hard time finding one. Nothing comes up specifically for the Gunnar, but I'm hoping maybe another gun might use the same size? The knurl nut would be roughly 28mm wide, and 12mm tall. Any ideas?

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If you can’t find one.. Bob Colletti can probably make you one… rcolletti onAGN. Good Luck. John