This video details the extensive quality control issues found in a Knight's Armament (KAC) SR-15 'blem' lower receiver. Multiple critical dimensions, including bolt catch pin holes, takedown/pivot pin holes, hammer/trigger pin holes, and the magazine well, were found to be out of spec. The owner opts for a custom repair involving drilling and tapping for a threaded bolt catch pin, highlighting the need for meticulous inspection even on high-end firearms.
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