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"Objective Lens Diameter: 40mm"

Butler Creek:

"Size 17 - Objective (MM) 40.9 - Part# 30170"

However, I can't get confirmation on whether these run tighter or looser, therefore whether to get size 15 or 17 for a 40mm objective..

Edit: size 15 (30150) is 39.6mm so I'm gonna recommend that for now..
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