Ballistics Advantage - Barrel Autopsy

This guide details a rigorous inspection and testing procedure for AR-15 barrels, as demonstrated by Preston Moore. It covers essential physical gauging, advanced borescope analysis to detect internal defects like pitting, and a structured approach to range testing with various ammunition types. The process emphasizes data collection for accuracy and velocity, highlighting the importance of thorough evaluation before and after live fire. Moore's objective and analytical approach provides high-level insights into barrel quality.

This guide, presented by Josh from AT3 Tactical, explains the fundamental concepts of AR-15 barrel rifling and twist rates. It details historical methods, modern manufacturing processes like button rifling, cut rifling, and cold hammer forging, and clarifies how twist rate impacts bullet stability based on weight. The information is presented with an emphasis on practical application for firearm owners.

This video details the construction of a 12.5-inch AR-15 'Mini Recce' rifle, emphasizing a balance between compactness and long-range capability. The build incorporates a custom 'hodgepodge' of high-quality components, including a Zero Delta upper, Ballistic Advantage barrel, Radian bolt carrier group, and a Swamp Fox 1-6x LPVO with a 12 o'clock red dot. The presenter, Jason, highlights the importance of component synergy for reliable performance and a comfortable shooting experience, even with a shorter barrel.

This guide details a comprehensive physical inspection of a Bear Creek Arsenal 16-inch AR-15 barrel, led by an expert from School of the American Rifle. It covers critical measurements like gas port size, headspace, and erosion, along with functional chamber tests and installation techniques including thermal fit and alignment checks. The inspection reveals potential issues with the throat length and crown, impacting compatibility with certain ammunition types.

This video provides an in-depth look at the manufacturing process of AR-15 components, including BCGs, barrels, and lower receivers, at DRG Manufacturing. It details the use of specific materials like Carpenter 158 and 4150 CMV steel, highlights advanced CNC machining and automation, and explains critical processes like heat treatment and precision grinding. The content is presented with high technical authority, offering detailed insights into achieving mil-spec tolerances and material properties essential for reliable firearm function.

This guide from AT3 Tactical provides a simple yet effective hack for correctly aligning an AR-15 gas block. By using the barrel's existing markings as a visual guide, users can ensure proper gas port orientation, preventing cycling issues. The presenter, with high authority in AR-15 assembly, demonstrates how to align the gas tube and block to cover these markings when viewed from above.

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.