The 2017 version used a normal-ass slickside upper. They are 100% doing this to cut costs and increase profit margins. See? This is what they used last time.
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Playing Devil's advocate here, maybe Aero Precision couldn't provide them the quantity they needed. But probably not. This was KE going "let's just do it ourselves!" and cheaping out.
My original plan was to wait for them to sell just the upper, buy that, and slap it on a (normal, forged) lower I already have lying around but honestly, fuck that terrible, gaudy-ass milled-out FA forging. I'll gladly pay more to buy a lightweight upper from some other company that doesn't look like garbage.