How to I.D. AR 15, M16 & Mil Spec Bolt Carrier Groups

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 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 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 video offers an extensive tour of Classic Firearms' warehouse, showcasing a vast array of surplus and imported firearms. Key highlights include Beretta 92S pistols, Zastava M57 Tokarevs with unique import safeties, and various European pistols like Hungarian FEGs, Makarovs, Nagant revolvers, and CZ models. The tour also covers classic rifles such as the Lee-Enfield and modern AR-15 components, alongside ample ammunition and accessories.

The M-1 Carbine in .30 caliber is a lightweight and maneuverable rifle with a rich history, serving from WWII through Vietnam. Despite its smaller round compared to the .30-06, it offers high capacity and manageable recoil, making it a viable home defense option today. Its design by Winchester, incorporating features from 'Carbine' Williams and Ed Browning, resulted in over 6.5 million units produced by various manufacturers.

The Ideal Conceal IC380 is a unique .380 ACP pistol designed to resemble a smartphone when folded, offering deep concealment. While its double-action trigger is heavy (around 11 lbs 15 oz) and accuracy is limited to close distances, its primary advantage is its discreet appearance. It functions as a two-shot derringer and includes safety features like inaccessible triggers when closed and firing pin blocks.

Glock's enduring popularity stems from its reliability, simplicity, and value, making it a dominant force in the handgun market for decades. Its widespread adoption by law enforcement, robust polymer construction, and high magazine capacity contribute to its reputation. While other firearms may offer more refined features, Glock's combination of price, durability, and consistent performance remains a compelling choice for many shooters.