Anderson Manufacturing Barrel Autopsy

This expert guide details a comprehensive 'barrel autopsy' procedure, as demonstrated by the School of the American Rifle. It covers essential checks including thread concentricity, material identification, magnetic properties of the extension, erosion gauging, bore straightness, gas port alignment, and headspace verification using specialized gauges. A critical borescope inspection revealed a manufacturing defect: a smoothbore barrel lacking rifling, highlighting the importance of thorough inspection regardless of brand or price due to potential quality control lapses.

This video demonstrates the CompMag, a fixed magazine solution for AR-15 style rifles designed to comply with restrictive firearm laws, particularly in California. It details the unique side-loading process for up to 10 rounds and provides a clear method for clearing double feed malfunctions by locking the bolt back and clearing through the ejection port.

This video demonstrates how to properly dimple an AR-15 barrel for a gas block using a BRD Engineering jig. Dimpling ensures the gas block set screws have a secure seating point, preventing movement and maintaining alignment with the gas port. The process involves using a specialized jig to accurately locate and drill the dimples, crucial for reliable firearm function.

This video details the critical process of crowning and chamfering a firearm's muzzle for improved accuracy and protection. It explains how a proper muzzle crown ensures consistent bullet exit, while chamfering manages gas dynamics. The guide covers re-crowning techniques, tool selection including brass vs. steel pilots, and finishing with lapping for a superior bore exit.

This video provides an "autopsy" of an Anderson Manufacturing Bolt Carrier Group (BCG) that failed after only 150 rounds, specifically noting a "sheared lug." The content focuses on a detailed examination of a firearm component failure, suggesting a deep dive into the mechanical aspects and potential causes of the malfunction. This is highly relevant for firearm owners and those interested in the reliability and build quality of AR-15 platforms and their components.

This video details the installation of front and rear takedown pins on an AR-15 lower receiver. It covers the necessary components, including springs and detents, and demonstrates the process for both pins. Key advice includes managing the small parts to prevent loss and adjusting spring tension for optimal feel. The tutorial also touches on using a set screw for the rear pin or relying on the endplate for retention.

This video details the diagnosis and repair of a feeding issue on a Sons of Liberty Gun Works East India upper receiver. The root cause was identified as a sharp burr on the barrel extension's feed ramp, causing rounds to jam. The solution involved polishing the feed ramps and adding a secondary bevel, replicating Colt's design, which successfully resolved the malfunction.

This video demonstrates the internal mechanics of an AR-15 bolt carrier group using cutaway models. It highlights the importance of internal bore dimensions for gas system efficiency and explains how to diagnose potential issues like gas leaks. The demonstration covers the cycle of operation, critical seals, and common manufacturing defects, offering advanced insights for AR-15 maintenance and troubleshooting.

This video provides a detailed autopsy of a faulty AR-15 Bolt Carrier Group (BCG). The analysis reveals critical manufacturing defects including an undersized bolt tail failing gauges, excessive firing pin protrusion causing pierced primers, an oversized firing pin hole, and an oversized cam pin hole leading to headspace issues. These flaws significantly compromise the BCG's function and reliability.

This video demonstrates a specialized technique for swapping an AR-15 rear takedown pin without full firearm disassembly. It highlights the use of a custom-fabricated tool, often made from a 1/16 inch Allen wrench, to depress the detent. The method allows for efficient pin replacement, particularly useful on rifles with staked castle nuts, by leveraging the old pin to guide the new one into place.