UNISSUED U.S.G.I. M16/A1/A2 ARMORERS TOOL KIT

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 guide details the process of converting an M16A1 lower receiver into an M16A3 configuration, a rifle primarily used by the US Navy. The key technical difference is the M16A3's full-auto fire control group (Safe-Semi-Auto) compared to the M16A2's three-round burst. The video highlights that FN Herstal manufactured many of these rifles for the Navy after Colt faced production issues.

This YouTube video focuses on a 'Simple M16 upgrade', indicating a modification or enhancement to an M16 rifle. The title suggests a straightforward process, likely involving adding or changing parts to improve functionality, aesthetics, or performance. Potential viewers can expect to see how to perform these upgrades and the results of the modifications.

This video demonstrates the use of a rare Rock Island Arsenal USGI trigger pull gauge for the M16 rifle. The gauge, inspected in May 1995, is designed to measure the minimum trigger pull weight, specified as 5 pounds plus 1 ounce for the M16A1. The instructor highlights its rarity and provenance, likely from the Bill Rica collection, and provides a step-by-step guide on its proper application in a safe, unloaded environment.

This video details the use of a rare 1973 U.S.G.I. firing pin protrusion gauge for the M16 rifle. It explains the gauge's components, calibration process using a dial indicator and set ring gauge, and its application on an M16 bolt carrier group. The presenter demonstrates how to check firing pin protrusion against specified tolerances, comparing it to other methods and highlighting its historical significance.

This video delves into the history and technical aspects of Colt's four-way enhanced rifle fire control group, a system offering Safe, Semi, Auto, and Burst modes. The expert instructor, with extensive experience at Colt, details the evolution of the burst cam, patent information, and specific rifle models that utilized this complex mechanism. It highlights practical challenges and historical context, including issues faced by the Greek Army and the eventual discontinuation of the program.

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.