The Sig552 handguards form Carrot are for the 550/551 I don't know if they will even work for the 552. From what I have seen fromt he pics available the handguard ring is different and some other parts on the handguard are either slightly different or not on it.
Good luck trying to get the B&T 552 RAS on it will most likely take some extensive cutting to get it to fit snug. I don't think Jun actually got the RAS on.
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