How Does It Work: Roller Locking

This video explains the roller locking mechanism, differentiating it from roller delay systems. It details how symmetrical rollers are forced outward into the slide by a central block, locking the barrel and slide together. The explanation covers how angled surfaces during recoil cause the rollers to retract, unlocking the barrel for cycling.

This video provides a detailed, visual exploration of the Colt Model 1900 Cutaway pistol, presented by Legacy Collectibles. It offers close-up views of the firearm's internal and external components, demonstrating basic operational functions like magazine loading, slide racking, and cartridge ejection. The presentation highlights the intricate mechanics of this historical firearm.

This video details the operation of the Pauly System pistols, highlighting Samuel Pauly's pioneering work on self-contained cartridges. The pistols feature a unique loading mechanism where the barrel pivots down for a percussion cartridge. Internally, they are hammer-fired, utilizing a free-floating striker retracted by a hook on the hammer, which then protrudes forward to ignite the cartridge upon trigger pull.

This video details a comprehensive custom build of a Heckler & Koch G3 rifle, specifically tailored for left-handed shooters. Key modifications include relocating the charging handle, upgrading to ambidextrous controls, a custom trigger job by Bill Springfield, and the integration of Magpul and Spuhr furniture for improved ergonomics and optics mounting. The build addresses common G3 deficiencies like poor recoil management and length of pull, resulting in a significantly more user-friendly platform.

This expert guide details the disassembly and internal mechanism of the Marston 3-Barrel Selectable Pocket Derringer, as presented by Ian McCollum of Forgotten Weapons. It covers the unique barrel selection dial, the firing pin alignment system, and the extractor mechanism on the improved 1864 model. The information is presented with a high degree of technical detail, suitable for advanced enthusiasts.

This video provides a detailed field stripping guide for the select-fire HK-33 battle rifle. It covers the systematic disassembly process, starting with safety checks and magazine removal, then proceeding to stock, trigger group, and bolt carrier group removal. The guide also details the disassembly of the bolt head, locking piece, and handguard, highlighting the roller-delayed blowback system.

This video details the unique 'French Finger Trap' issue with the MAS-36 rifle's bayonet, where two rifles can become unintentionally locked together. A 1951 French arsenal memorandum identified this problem, proposing a simple modification to the bayonet handle. Drilling a small hole allows a tool, like a firing pin, to depress the internal spring, enabling the separation of locked rifles.

The M134 Minigun is a scaled-down 7.62 NATO rotary cannon, requiring 24V DC power and consuming 1.5 kW. Its high rate of fire (3,000+ RPM) is essential for aircraft engagement windows. The complex delinker mechanism is critical for feeding ammunition, and practical hand-held use is impossible due to weight and recoil. Live fire demonstrates rapid ammunition consumption and the need for indirect aiming.

The H&K G11 is a revolutionary prototype assault rifle designed in the late 20th century, notable for its caseless ammunition and unique rotating drum bolt mechanism. Despite advanced features like a 2000 RPM burst fire rate and integrated optics, its development was ultimately halted by geopolitical shifts and cost concerns.

This video demonstrates the assembly and live-fire of the German 1936 pattern light mortar (L.Gr.W.36). It highlights the mortar's leveling mechanism for accuracy and the difficulty in visually tracking its 50mm projectiles after firing. The content showcases historical military hardware and its operational use.