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Sorry if I've got the wrong end of the stick but I'm guessing you're worried that Cradle's carrier is based on the V1 because it's an older design and not the latest. If so you needn't worry as the V1 was a better design than the V2 (Cradle made the carrier because KJ stopped making the v1).
From when I last was into KJ m4 the two versions of bolt were interchangable in all KJ upper receivers. However I read recently that there was a problem with an aftermarket charging handle sticking in the latest version of the upper. If you're going to go KJ best to check up on the latest news to see about compatibility.
Strictly speaking the most reliable GBBR out of the box would be the non-serialised KJ m4 with the revised v1 bolt that is long enough to prevent the buffer from hitting the buffer detent and cracking the lower receiver (resulting in stuttering full-auto).
There's also the issue of the piston cup cracking which can be resolved using the Cradle o-ring piston.
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