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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 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.

Elliott Delp showcases his favorite AR-15 build, a compact and mobile SBR emphasizing both aesthetics and functionality. The build features a Daniel Defense upper receiver known for reliability, paired with traditional A2 sights and modern accessories like a vertical foregrip and red dot optic. Live-fire demonstrations highlight its performance and manageable recoil.

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 YouTube video, titled 'Fazendo upgrade na minha AR15' (Making upgrades to my AR15), focuses on modifications and enhancements for the AR-15 platform. While the description is minimal, the title clearly indicates a gunsmithing or custom build theme revolving around this popular rifle. Viewers can expect content related to improving an AR-15, potentially showcasing new parts, installation processes, or performance improvements.

This YouTube video showcases an exceptionally high-end custom AR-15 build, with a stated value exceeding $10,000 and an estimated cost of $12,000. The title highlights its designation as a lightweight, all-purpose hunting rifle. The description reinforces its suitability for various roles if budget is not a constraint. The content likely focuses on the components, assembly, and potential performance of this premium firearm.

This video humorously presents the AT4 anti-tank weapon as a 'truck gun' by 'The Gun Guy Cody'. While not a practical choice for concealed carry or typical self-defense, the video highlights its portability via a built-in strap. The content is satirical, contrasting a military-grade weapon with everyday carry expectations.

This video demonstrates essential steps for preparing an AK-47 style rifle. It covers loading a 7.62x39mm magazine, chambering a round by cycling the bolt, and attaching an AK-style bayonet. The content highlights practical firearm readiness for potential use.

This video showcases a Russian soldier successfully neutralizing an incoming drone with a 12-gauge shotgun in a combat zone. The engagement occurred at an estimated range of 20-30 yards, demonstrating the practical effectiveness of shotguns for drone defense despite prior skepticism. The footage highlights a single, decisive shot.

This video provides a visual overview of U.S. military ammunition, ranging from common small arms like 9mm and 5.56mm to heavy machine gun rounds like .50 BMG. It also showcases larger munitions such as 20mm, 30mm (including variants for the AH-64 Apache and A-10 Warthog), and 40mm autocannon rounds. The presentation highlights the diversity of calibers and their associated platforms.