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All of the 39mm Dunes that I purchased from there & elsewhere that had warpage issues, flattened out like bricks. Perfect. However, for whatever reason, I could not get the 43mm to flatten out nearly as well. After a buying a barrel where half had issues, I finished out my set of 1000s/5000s by buying them in person at the store (but I'm pretty picky). Just FYI.