Clutch and Breaker (RAM pack) had a running change where they got the new fixed arms in later cases. Those are the ones showing up in stores in the carry forward assortments. So far those are the only ones (and the second run of Doc) that have the fixed arms. Leatherneck (AWE Striker), v.1 Duke and the others with the infamous Duke arms haven't been fixed. Tiger Force Duke was the first to get the new arms and so far all the Duke arm figures that have come out since have had them.

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Of course that's just my opinion, I could be wrong.