Is an AR15 Direct Impingement or Internal Piston? DI, External/Internal Piston Explained

This guide explains the function of the buffer tube in an AR-15 or AR-pattern rifle, as demonstrated by Jared from GUNBROS. The buffer tube is a critical component of the operating system, housing a buffer and spring. Upon firing, the bolt carrier group compresses this spring and buffer assembly as it moves rearward, and the subsequent expansion of the spring drives the BCG forward to chamber the next round. This process is essential for the semi-automatic function of AR-pattern firearms.

This guide details the essential steps for lubricating a new AR-style rifle before its initial firing, as demonstrated by an experienced instructor. It covers proper disassembly, specific lubrication points on the bolt carrier group and trigger mechanism, and reassembly. The video emphasizes the importance of lubrication for new firearms, drawing a parallel to car maintenance, and highlights the performance of the We The Pieu MX1 lubricant in hot conditions like those found in Utah.

This video from Brownells, featuring Caleb, explores the optimal zero distances for an AR-15, primarily for competition use. It analyzes four common zero distances: 25, 36, 50, and 100 yards, detailing their impact zones on an IPSC A-zone target at various ranges. The instructor emphasizes that the 'best' zero is dependent on the intended use of the firearm and the optic employed, recommending the 100-yard zero as a versatile option for experienced shooters, while suggesting 36 or 50 yards for those using red dots or LPVOs respectively, especially for closer engagements.

The Iraqveteran8888 "Meltdown" video series, while primarily for entertainment, offers educational insights into firearm durability under extreme stress. The videos demonstrate that AR-15 gas tubes are a common failure point, often exploding around 650-750 rounds of full-auto fire. This testing highlights the importance of materials like Inconel for components subjected to high heat and pressure, suggesting potential for improved firearm design and longevity.

This video demonstrates the proper procedure for loading and unloading both primary (rifle) and secondary (pistol) weapon systems, emphasizing a specific order for safety and efficiency. It covers magazine insertion, slide/bolt manipulation, and chamber verification, along with tactical considerations for managing ammunition and readiness.

John Lovell, demonstrating expert-level knowledge of the AR-15 platform, explains the function of the forward assist. This feature is designed to manually drive the bolt carrier group fully into battery when fouling, debris, or other issues prevent it from seating properly. Lovell compares its utility to backup sights, emphasizing its value as a redundancy for ensuring reliable operation, especially in adverse conditions.

This video offers a highly critical, historically grounded analysis of the M14 rifle's shortcomings, attributing its failure to flawed US Ordnance Corps decisions regarding cartridge standardization and weapon design. The speaker, an expert in small arms, details how political motivations and resistance to innovation led to the adoption of an inadequate weapon system, contrasting it with superior alternatives like the AR-10 and FN FAL. The analysis highlights the detrimental impact of these decisions on US military effectiveness, particularly in Vietnam.

This expert-level entry details the M16's troubled introduction in Vietnam, debunking myths of inherent design flaws. It highlights how political decisions, procurement issues, and ammunition choices, rather than the core design by Eugene Stoner, led to early reliability problems. The entry emphasizes the mechanical evolution from the AR-15 to the M16A1 and the critical role of chrome lining, proper maintenance, and correct ammunition in establishing the platform's eventual success.

This guide, drawing on the expertise of a former Colt employee and AR-15 SME Hank Tatro, details the critical role of AR-15/M16 buffers. It explains how buffer design evolved to manage bolt carrier bounce caused by increased firing rates and different ammunition types. The guide emphasizes selecting the correct buffer for specific firearm configurations and warns against improper mixing and matching, particularly for duty applications. It covers standard rifle and carbine buffers, as well as H, H2, H3, and specialized 9mm buffers, providing insights into their construction and application.

This comprehensive review by Chris Bartocci, a recognized expert with extensive military armory experience, debunks common myths surrounding the Beretta M9/92FS. Bartocci details the pistol's history, including its selection over the M1911, and addresses controversies like slide failures, attributing them to ammunition and high usage rather than design flaws. He highlights the evolution of critical components like the locking block and discusses magazine reliability issues, offering practical insights for owners and enthusiasts.