This video details a critical dimensional issue found in a KAK Milspec Bolt Carrier Group (BCG): an undersized bolt face diameter. This specific measurement impacts cartridge chambering and ejection, potentially causing malfunctions. The instructor demonstrates how a gauge fails to fit, highlighting the importance of precise manufacturing tolerances for reliable firearm operation.
The video details persistent extraction and ejection issues with an 80 Percent Arms GST-9 pistol, even after cleaning, lubrication, and trying different ammunition. The presenter experiences cases getting stuck in the chamber, preventing proper cycling. Despite liking many of the pistol's features, the recurring malfunctions lead to frustration and a need for deeper investigation.
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