Prototype CZ-38 Trials Rifle

This expert-level explanation details the unique long-recoil action of the Stamm-Saurer Model 1913 prototype rifle. It highlights the integrated safety and dust cover, and meticulously breaks down the cycling process, including barrel recoil, bolt locking, ejection, and the bolt rotation mechanism driven by cams and grooves. The instruction emphasizes the intricate mechanical interplay required for this less common firearm design.

This video showcases a rare Colt prototype rifle from the Colt Custom Shop, featuring a unique digital anodized camouflage finish and an advanced internal piston system derived from the 'Individual Carbine' project. Key components include a Geissele SSF-A trigger marked for the US Marine Corps and a highly user-friendly prototype cross-bolt gas valve. The speaker critiques Colt's historical tendency to develop innovative firearms without releasing them to the civilian market.

This video details a custom HK XM8 rifle build by Tommy Built Tactical, based on the HK SL8. The build costs around $5,000 and features custom-molded parts, interchangeable magazine wells for G36 or AR-15 mags, and an Insight ISM-V optic. It offers a unique look at a rifle that was extensively tested but never adopted by the US Army.

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.