Rare 1973 M16 U.S.G.I. Firing Pin Protrusion Gauge

This guide clarifies the operational mechanics of the AR-15/M16 gas system, distinguishing it from true Direct Impingement (DI) systems. Drawing on Eugene Stoner's patents and visual evidence of components like the bolt carrier group, it explains the AR-15's internal piston design. The information is presented with high authority, referencing historical firearms and patent details.

This guide details 17 lesser-known features and maintenance hacks for common firearms, including AK-47/74 buttstock cleaning kits, S&W M&P frame tools for disassembly, Mossberg magazine dowels for capacity control, and status indicators on various pistols. The instruction emphasizes utilizing manufacturer-provided tools and understanding specific firearm mechanisms for safe operation and maintenance, drawing on expert knowledge of firearm platforms.

This video offers a deep dive into high-end motorcycle engine and transmission rebuilding services offered by Dragonman, a recognized expert in machining and firearms. He details various rebuild processes, pricing structures, and his unique 'rebuild your own motor' service, emphasizing quality and decades of mechanical experience. Dragonman also touches upon his extensive background as a Class 3 Full-Auto Machine Gun Dealer and Manufacturer.

This guide details the process of converting older M16 and M16A1 rifles to the M16A2 standard using conversion kits. It covers component identification, lower receiver modification, and reassembly, drawing on the expertise of firearms historian Chris Bartocci. The process involves replacing the upper receiver, stock, and fire control group, while carefully re-marking the lower receiver to reflect the A2's burst fire capability and updated model designation.

This video focuses on building and maintaining U.S. Service Rifle clones, featuring specific components and accessories. It showcases a Trijicon ACOG scope with a ballistic reticle, an M16A1 rifle, and various slings for M1 Garand and other rifles. The description also lists cleaning kits, targets for zeroing, and mentions an Armorer's Manual. The video appears to be a resource for enthusiasts interested in historical military firearms and their modern equivalents, providing links to purchase recommended gear and offering discount codes for various firearm-related businesses.

This guide details the process of staking AR-15 carrier key screws, a critical step for preventing loosening under operational stress. It covers historical staking methods, modern techniques like OCKS, and specific torque values for different generations. The instruction emphasizes the importance of proper staking for reliability, drawing on historical military technical manuals.

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.