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From what I recall, it's not compatible. The 552 uses a short cylinderhead nozzle, like the one the AK-47 uses. There's a possibility I could be wrong on this.
I don't know about the compatibility of the 552 and 550 air nozzle, but I have a strong feeling that they won't match.
My recommendation? The 552 is not meant to be a gun that can support such a huge inner barrel and/or such high velocity. You don't really have a need for a bore up kit in it.
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