USGI Armorer's Gauges & Tools

This guide, presented by School of the American Rifle, details how to identify and replace a malformed weld spring in an AR-15 Delta Ring assembly. A misaligned weld spring can cause the gas tube to be pushed off-center, leading to excessive friction or damage to the carrier key and gas tube. Replacing the faulty component ensures proper gas tube alignment and firearm reliability.

This YouTube video offers practical tips and techniques for polishing stainless steel firearm components. The content focuses on achieving a high-quality finish on gun parts, likely aimed at gunsmiths, hobbyists, and firearm enthusiasts looking to customize or maintain their weapons. The video emphasizes real-world application and likely demonstrates various methods and tools used in the polishing process for stainless steel firearms.

This content demonstrates the disassembly and reassembly of a Ruger Mini-14, highlighting a critical issue with the trigger group breaking. The speaker, exhibiting experienced firearm handling, shows the broken components and guides through the reassembly process. The video also touches on suppressed shooting and gas management.

This guide details the process of replacing a faulty extractor on a 2011-platform handgun, specifically addressing recurring extraction failures experienced with the Bul Armory SAS II Ultralight. The video demonstrates the installation of an Atlas Gunworks extractor, a common aftermarket upgrade for 2011s, and highlights the importance of proper tensioning for reliable firearm function. The speaker, an experienced firearms instructor, provides practical advice based on extensive troubleshooting and range testing.

This expert-level guide details the assembly and disassembly of the Ruger Red Label III over/under shotgun. It emphasizes safety protocols, including ensuring the firearm is unloaded and wearing safety glasses. The process involves separating the receiver/stock from the barrel/fore-end, with specific instructions for fore-end removal and reattachment. Crucially, it highlights the need to fully move the top lever right before barrel installation to avoid damage, followed by a function check of the safety and barrel selector.

This guide provides expert-level instructions for cleaning the Ruger Red Label III Over/Under Shotgun, drawing from a Ruger Firearms Tech Tip. It details a comprehensive step-by-step process for disassembly, cleaning individual components like the bore, choke tubes, receiver, and fore-end, and proper reassembly. The guide emphasizes critical safety precautions throughout the procedure, including the use of safety glasses and ensuring the firearm is unloaded.

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.