Dual Ejector AR Bolts - The Good and the Bad

This video from GUNBROS explains the function of a buffer tube on an AR-15 or AR-pattern rifle. As demonstrated by the instructor, the buffer tube is attached to the lower receiver and houses the buffer and spring. When the rifle fires, the bolt carrier group compresses this assembly, which then returns forward to chamber the next round. The video emphasizes the critical role of the buffer tube in the AR-15's operating system.

This guide details troubleshooting steps for 300 Blackout FRT setups experiencing cycling issues. It emphasizes the critical role of ammunition variability, buffer and spring combinations, and suppressor choice. The video demonstrates a systematic approach to diagnosing and resolving problems, including feed ramp polishing and magazine selection, offering practical advice for optimizing performance.

This content from Regular Guy Training LLC discusses the merits of external piston AR platforms, specifically referencing the BRN-4. The instructor, demonstrating experienced authority, highlights that while traditional internal piston ARs are reliable and widely understood, external piston systems offer distinct advantages. The video suggests that external piston designs can lead to a better-assembled AR than many manufacturers produce, emphasizing the importance of knowledge in firearm customization and maintenance.

This expert analysis from Regular Guy Training LLC details the impressive wear characteristics and endurance of the BRN-4 firearm. Through extensive testing, including 21,000 rounds with 6,000 suppressed, the BRN-4 demonstrates remarkably even wear on its moving components, particularly the front-located piston and gas rings. The system maintains reliability and a flat shooting impulse even under extreme conditions, drawing comparisons to the mechanical feel of an AK platform.

This entry details the background of John Lovell, an Army Ranger with extensive combat experience in Afghanistan and Iraq. He is the author of 'The Warrior Poet Way' and a prominent firearms trainer and speaker through the Warrior Poet Society. Lovell's expertise is highlighted by his military service and his role as an educator in the firearms community.

This video showcases advanced firearms training conducted by GBRS Group, featuring operators in full tactical gear. It highlights dynamic entry drills, close-quarters battle, pistol marksmanship, and carbine shooting techniques. The training emphasizes proficiency in various environments, including low-light conditions with night vision, and covers tactical movement, room clearing, and pre-operational briefings. The content demonstrates a high level of expertise and professionalism in tactical firearms instruction.

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.