That was my thought when I read complete BCM upper and lower. A complete factory BCM may *may* have a better fit between the upper and lower than your gun does, but functionally there is nothing to worry about.
I effectively built an LMT SPM14 with a lightly used complete LMT upper and a complete LMT Defender lower. Saved a pretty penny doing it and ended up with a gun I can be rightfully proud of https://lmtdefense.com/firearms/spm14
The only thing you and I cannot do is honestly sell them as complete factory guns.
Andy
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