Videos tagged with Bolt Tail Seal

This guide details a diagnostic technique for AR-15 bolt carrier groups, focusing on efficiency rather than simple pass/fail. Developed by Chad Albrecht of School of the American Rifle, it uses custom gauges and cutaway components to illustrate gas dynamics, critical seals, and potential failure points like gas leaks. This advanced method helps troubleshoot functionality issues and understand the nuances of the AR-15's internal gas system.

This video provides a detailed physical inspection and gauging of a Centurion Arms bolt carrier group (BCG). It covers checking for machining marks, staking quality, and uses pin gauges to measure critical dimensions like the carrier's 3-bore, bolt tail seal, and bolt shoulder support. The instructor also demonstrates how to perform a reverse torque test on the gas key and checks for proper firing pin protrusion and headspace. While some areas showed minor roughness, the overall assessment indicates a functional and well-manufactured BCG.

This video provides a detailed physical inspection of two Salient Arms International Bolt Carrier Groups (BCGs). The instructor, with clear expertise in firearm components, meticulously gauges and examines various aspects of the BCGs, including headspace, extractor fit, gas key dimensions, firing pin protrusion, and internal finish. Several issues are identified, such as oversized gas keys, potential extractor problems, a failed firing pin hole gauge, and significant internal machining marks, highlighting potential quality control concerns with these specific units.

This video provides a detailed physical inspection of a Knight's Armament Sandcutter Bolt Carrier Group (BCG). It covers essential checks like bolt protrusion, extractor function, headspace, and gas ring integrity using various gauges. The instructor also performs a reverse torque test on the carrier key screws and identifies minor gas leakage, leading to a recommendation for carrier key replacement and proper staking.