Bernardelli UB: Hammer and Striker Fired 9mm Blowback

Mark Serbu demonstrates a 3D-printed fixture designed to test various magazine catch positions for blowback-operated pistols. The fixture allows for precise adjustments in both vertical and horizontal planes, enabling the user to find the optimal position for reliable feeding. By incorporating weight into the simulated bolt, the fixture helps analyze the momentum required for successful chambering, with high-speed video used to observe the feeding dynamics.

This video analyzes an interesting extractor failure on a Schwarzlose 1898 pistol using slow-motion footage. The description discusses the necessity of extractors in firearms, noting that some early blowback pistols and later Spanish models functioned without them, relying on residual chamber pressure. The Schwarzlose 1898, however, is equipped with an extractor that malfunctioned in this shooting session. Two instances that appeared normal in real-time were revealed as extractor failures upon reviewing the high-speed footage, making them an excellent case study.

This guide details the specific technique for separating two MAS-36 rifles that have been inadvertently locked together by their bayonets. It outlines the historical context of this issue, the modification made to the bayonet to resolve it, and the step-by-step procedure for disengagement. The technique requires precise alignment and the use of a pointed tool to access the internal release mechanism, as demonstrated by firearms expert Ian McCollum.

This guide details the loading and firing procedure for the M134 Minigun, as explained by Ian McCollum. It covers manual indexing of the barrel cluster, feeding the ammunition belt, engaging controls, and firing. The guide also touches upon the weapon's spin-down inertia and the function of modern clutch systems. Expert instruction from a recognized firearms historian highlights the technical aspects of operating this powerful weapon system.

This guide details the operational features of the H&K G11 K2, a prototype assault rifle known for its caseless ammunition and unique rotating drum bolt. It covers the selector settings, magazine capacity, integrated optics, and the internal action designed for recoil management during high-rate-of-fire bursts. Expert insights from Ian McCollum highlight the historical context and technical innovations of this advanced firearm.

This guide details the operation of the German L.Gr.W.36 50mm light mortar, as demonstrated by expert Ian McCollum. It covers assembly, leveling procedures, ammunition handling, and live fire execution, emphasizing the difficulty in visually tracking the projectile. The instruction highlights the importance of proper setup for accuracy.