Acecare 0.35Liter tank for Impact Compact?

Between my arrows is the spacer, your arrow is the valve itself which screws into the spacer, you need this amount of spacer with the ACECARE bottle to fit the STANDARD FX rail.

We have done loads of these, I can assure you I am correct!

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I see what you did there.
 
I believe you, I'm just making sure I understand. While I know it doesn't make sense, looks like the part between your arrows is the FX Valve because of the hole in the side of it. See photo. Anyway, you are saying that that bottle will take a spacer and still work on the Impact without milling the bipod rail? Which bottle is mounted to the blue Impact?

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Apologies my "correct" statement sounded arrogant but it wasn't meant to be, the spacers also have the hole in them for tightening with a ring spanner, they also come supplied with a stainless finish but those are painted black to match the bottle, the picture is the 220cc ACECARE bottle from memory, they make 2 versions but the neck shape is the same.

I will see if I can find a picture of them mounted in stainless so they show up better.