RE: Hitec 55's with FMA receiver?
Yes I have four attached to the FMA M5, but only two of mine make noises, the other two don't. They are all NIB but two of them are older than the others, but I don't remember which are the old and which are the newer servos so I don't know if the old ones or the new ones are making the noises. They all work fine just noisy.
fossil