Videos tagged with Bolt Face Diameter

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.

This video demonstrates a critical quality control check for AR-15 bolt carrier groups: the bolt face diameter. Using a specialized notched gauge, the instructor highlights how undersized bolt faces can lead to cartridge base wedging, preventing clean ejection. Several popular manufacturers' BCGs are shown failing this check, emphasizing the importance of verifying this spec, especially with certain ammunition types.