AR-15 - Upgrade! KNS Precision Non-Rotating Pins Installation

This entry details the unique XR-86 custom rifle, a 1986 build by Wilfred Ellis. It masterfully combines components from an M60 (flash hider), an M14 (gas system), and an AR-15 (trigger, bolt, locking system). The AR-15 trigger is notably rotated 90 degrees, and its bolt is integrated with the M14 gas system, showcasing advanced gunsmithing.

This video from School of the American Rifle highlights critical manufacturing defects in AR-15 bolt carrier keys, specifically focusing on rough internal bores. Lead instructor demonstrates how a poorly finished carrier key can cause significant friction, premature wear on components like gas tubes, and operational issues, contrasting a problematic new Colt carrier with a well-functioning older model. The expert emphasizes the importance of a smooth bore for reliable function and longevity of expensive parts.

This guide, presented by an expert firearms instructor, details the benefits and installation of adjustable triggers for platforms like the AR-15. It covers understanding trigger mechanics, adjusting pull weight, reset, and overtravel, and highlights ideal users for these components. The instruction emphasizes safety and practical application for competition and precision shooting.

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 video provides a comprehensive, step-by-step guide to building a .300 Blackout AR-15 pistol. Caleb from Brownells walks viewers through the entire process, from selecting top-tier components from manufacturers like Aero Precision and Sons of Liberty Gun Works, to detailed assembly of the lower receiver, upper receiver, gas system, and the installation of accessories such as optics and lights. The guide offers valuable tips on essential techniques like staking castle nuts and setting torque specs, making it an ideal resource for both novice builders and those seeking to learn more about AR-15 customization.

This YouTube video focuses on a common and crucial aspect of firearm ownership: the buffer system. The title, "What buffer system do you use?", directly asks for viewer input on their preferred buffer systems. While the description is empty, the title alone indicates a discussion or inquiry into different buffer systems, which are vital components for the reliable operation of firearms, particularly semi-automatic rifles like the AR-15 platform. Viewers interested in firearm maintenance, customization, or performance optimization would find this content relevant.

This video provides a detailed guide on loading a 75-round drum magazine for the AK-47, specifically a Romanian variant. It covers identifying components like the follower and spring tension release, resetting the follower, and the correct procedure for inserting rounds. The tutorial also emphasizes the importance of winding the spring correctly and releasing tension for long-term storage to preserve spring health.

This beginner's guide to the AR-15 covers essential external components, controls, and the basic cycle of operation. It emphasizes proper magazine seating with a firm 'whack' and demonstrates field stripping for cleaning. The video highlights key aftermarket parts from brands like Magpul and Battle Arms Development, offering practical advice for new AR-15 owners.

This video demonstrates the proper installation of an A2 style flash hider on an AR-15 barrel, emphasizing critical steps for optimal performance. Key takeaways include using a crush washer with the correct orientation, applying grease to threads, and precisely indexing the device to prevent dust kick-up when shooting prone. The speaker highlights the importance of aligning the solid portion downwards and using a pin to verify alignment with the gas port for a secure and functional installation.

This video details the critical process of checking headspace on an AR-15 build, emphasizing safety and proper function. It covers the complete disassembly of the bolt carrier group, the precise use of 'Go' and 'No-Go' gauges to verify chamber dimensions, and the reassembly of the BCG. The demonstration highlights the importance of ensuring the bolt does not close on a 'No-Go' gauge to prevent dangerous headspace issues.