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FX Impact o-ring help

I guess I'm a bit confused by the diagram on the FX website. In the drawing for barrel kit, A3 is 2 o-rings. They are 10mmx2mm. But on the B diagram, they are calling them out as caliber specific. Yet B3 is the same as A3. I'm wondering if the schematic is mislabeled. Anyway, I figured there are plenty of you out there that have had hands on experience with the platforms and could inform me of real world.