HOW-TO CHOOSE // The Best BCG (Bolt Carrier Group) for Your AR 15

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 video provides an "autopsy" of an Anderson Manufacturing Bolt Carrier Group (BCG) that failed after only 150 rounds, specifically noting a "sheared lug." The content focuses on a detailed examination of a firearm component failure, suggesting a deep dive into the mechanical aspects and potential causes of the malfunction. This is highly relevant for firearm owners and those interested in the reliability and build quality of AR-15 platforms and their components.

This guide details the evolution of AR-15 carrier key staking from early 'Gen 1' square staking to modern 'Gen 5' OCKS with serrated heads. It emphasizes proper torque values (vintage 35-40 in-lbs, modern 55-58 in-lbs) and the importance of sufficient metal displacement for screw security. The video, presented by an expert from School of the American Rifle, critiques commercial staking and references historical technical manuals.

This video demonstrates the cleaning and restoration of a heavily fouled Daniel Defense Bolt Carrier Group (BCG) using the Tactical Elites gun cleaning kit. It covers step-by-step disassembly, thorough scrubbing to remove carbon buildup, and meticulous reassembly. The process highlights the importance of proper firearm maintenance for preserving component integrity and functionality, showcasing the effectiveness of the cleaning kit.

This video details 17 habits to extend an AR-15's lifespan beyond 20,000 rounds, challenging the notion of limited rifle durability. Key practices include regular, but not excessive, cleaning from the chamber, inspecting critical components like the gas key and bolt lugs, and replacing springs on a schedule. Proper lubrication and managing heat through controlled firing are also emphasized for optimal performance and longevity.

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.

Avoid common pitfalls when building an AR-15 by planning your rifle's purpose and budget first. Prioritize quality for critical components like barrels and BCGs, and avoid overspending on standard lower receivers. Use proper tools and techniques for barrel installation to ensure accuracy and longevity. Focus on functionality over aesthetics, and be aware of potential issues like receiver slop.

Choosing your first handgun involves defining its purpose (carry, defense, range), understanding gun types (striker vs. hammer-fired), and considering size categories from subcompact to full-size. 9mm is recommended for its balance of capacity and recoil. Proper ergonomics, including trigger finger reach and control manipulation, are crucial. Testing firearms at a range before purchase is highly advised, with models like the Glock 19, CZ P-10 C, and S&W M&P 2.0 Compact being top recommendations for new owners.

This video provides a comprehensive guide to essential AR-15 upgrades under $100, focusing on improving reliability, ergonomics, and performance. Key recommendations include indexing the cam pin, upgrading to better bolts or extractor kits, installing drop-in triggers, and enhancing grip and stock options from brands like B5 Systems and Magpul. The host also covers foregrips, ambi controls, muzzle devices, and essential maintenance items like White Lithium Grease.

The CMMG MK57 in 5.7x28mm offers impressive performance with low recoil and minimal muzzle rise due to its Radial Delayed Blowback system. While technically superior to many AR pistols, the high cost and limited availability of 5.7x28mm ammunition make it an impractical choice for most consumers. The review highlights build components, range testing, and a detailed look at the unique operating system.