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Hi D2D. I did the exact test shown in your videos. I have pretty much the same play in your first video and addendum video. I also use digital caliper, results: guide rod 4mm. guide rod hole 4.15 ( only 0.5 difference from yours but not sure if that is enough to cause your problem).
Mine is working flawlessly though.
I noticed two unusual:
1. Your plastic bolt head seems to have more play than mine.
2. For the bolt lock, your bolt carrier was unusually more forwarded exposed. It should be more backward when locked. Mine is only exposing 10mm of bolt carrier. (note: bolt carrier only, Plastic bolt was not included in the 10mm measuremet)
Hope it helps isolate the problem.
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Unseen but Certain
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