2 PSA Upper Receiver Autopsies - Part 1/3

This guide details the process of lapping an AR-15 receiver to ensure proper barrel alignment for improved long-range accuracy. Instructor Stephen Caleb from Brownells explains that receiver faces can be slightly out of alignment, leading to barrel runout. The process involves using a specialized lapping fixture and aluminum oxide lapping compound with a drill to create a perfectly flat receiver face. This ensures the barrel seats flush and square, critical for precision shooting beyond 500 yards.

This guide details the installation of an aftermarket AR-15 trigger, specifically a Timney Triggers product, into a clear lower receiver. The process involves unboxing, component inspection, mounting the trigger assembly with pins, and performing a function check. The demonstrative tone and clear handling of components suggest an experienced instructor guiding the viewer through a common firearm modification.

This guide addresses a critical quality control issue identified by Shortshot Tony on a new Daniel Defense Mk18 upper receiver: a loose barrel nut. The video demonstrates how a hand-tight barrel nut leads to significant rail wobble. It highlights the importance of proper torque for AR-15 assembly and compares this failure to lower-tier brands, emphasizing the need for robust quality control even on premium components.

This guide details how to use the Rise Armament Oh Sh*t Kit for AR-15 builds and maintenance, focusing on managing small, easily lost parts. The kit features a magnetic base to secure components like detent pins and springs, making assembly less frustrating. It's presented as an essential item for AR-15 owners who frequently encounter issues with misplaced parts during builds or upkeep.

This guide outlines how to build an RPK-inspired rifle on an AR-15 platform. Key modifications include a 24-inch barrel for accuracy, a large muzzle brake for rapid follow-up shots, a bipod for stability, and a fixed stock for consistency. A side-charging upper is also suggested for easier reloading.

This guide details the assembly and basic operation of the Bear Creek Arsenal BC15 bolt-action AR upper, as presented by Moondog. It covers mounting the upper, cycling the action, and bolt removal for cleaning. The review highlights the budget nature of the component, noting potential cosmetic blemishes and a rough action requiring break-in and lubrication.

This guide details the process of diagnosing and repairing an owner-induced feeding problem in an AR-15 upper receiver, specifically addressing a burr on the barrel extension's feed ramp. Expert gunsmith Chad Albrecht demonstrates meticulous inspection, burr removal, and polishing techniques to restore reliable feeding. The video emphasizes that such modifications, while often overlooked, are valid solutions for specific AR-15 malfunctions.

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 critical, expert-level inspection of a problematic AR-15 Bolt Carrier Group (BCG) by Chad Albrecht of School of the American Rifle. The analysis details numerous manufacturing defects, including an undersized bolt tail, excessive firing pin protrusion, oversized firing pin and cam pin holes, and a failing headspace check. The content highlights the importance of precision gauging in identifying critical failure points that impact rifle reliability and safety.

This guide details a specialized technique for swapping an AR-15 rear takedown pin without requiring a full disassembly. It leverages insights from Chad Albrecht of School of the American Rifle, emphasizing the use of a modified 1/16 inch Allen wrench or a specialized tool to manage the detent. This method is particularly useful for AR-15 variants with collapsible stocks, offering a more efficient approach to maintenance.