Trunnion Harvest!

This video focuses on the intricate machining process of trunnions for the BFG-50A rifle. The creator highlights the challenges encountered, particularly with creating small threaded holes for a patented spoke system, and expresses relief at overcoming these hurdles. The content is aimed at those interested in the technical aspects of firearm manufacturing and CNC machining, promising to share interesting insights for viewers not already familiar with the field.

This video showcases an extremely small tungsten carbide thread mill being used to cut threads on a BFG-50A trunnion. The creator highlights the minuscule size of the tool and expresses a sense of apprehension while using it, inviting viewers to share if they've encountered even smaller tools. The content focuses on a specific machining operation relevant to firearms manufacturing or modification.

Brandon Herrera's first AK build class focuses on teaching enthusiasts to construct their own AK rifles from parts kits. The course covers essential gunsmithing techniques, including receiver types, trunnion installation, barrel press-fitting for headspacing, and riveting using hydraulic presses. The class culminates in range testing of the completed firearms.

This video addresses common wear patterns on the bolt and trunnion of an AK-pattern rifle, specifically identifying it as a normal "marrying process" during the initial 1,000 rounds. The presenter shows visual examples of this wear at various round counts (100, 250, 500, 750, 1,000, and 5,000) to demonstrate that it's a sign of the rifle becoming smoother and more reliable, not a defect. The video also touches on headspacing in relation to AK rifles and mentions Palmetto State Armory's lifetime warranty.

This Brownells Tech Tip focuses on the innovative feed ramp design of the BRN-180 rifle chambered in .350 Legend. The video highlights how the BRN-180's single, large feed ramp, made possible by its trunnion design, overcomes the feeding challenges often associated with heavier .350 Legend bullets in AR-style platforms. This design is particularly beneficial for enhancing reliability with subsonic ammunition, offering a distinct advantage over the standard AR-15 dual feed ramp system. The content aims to educate viewers on the engineering principles behind this firearm's improved feeding performance.

Mark Serbu details the complex process of converting a CNC lathe into a 12-barrel blank-firing machine gun. The project highlights the critical role of a lathe's C Axis for precise rotational control and the application of PID control theory to overcome initial firing failures. Modifications were made to ensure the device fires blanks only, avoiding legal issues.

This video demonstrates how to rifle a barrel in a home shop using basic tools, bypassing expensive CNC equipment. It covers material preparation, precise drilling and reaming, and the critical process of pushing a rifling button. While a DIY approach is shown to be possible, the video highlights the significant difference in quality and precision achievable with professional CNC machining.

This video provides an in-depth analysis of the Serbu RN-50 rifle that experienced a catastrophic failure during a Kentucky Ballistics test. Mark Serbu, the designer, meticulously examines the damage, noting severely bent steel side plates, sheared-off breech cap ears, and a sheared pivot pin. The inspection also covers the breech cap's condition, barrel threads, and the stuck casing, revealing a case head separation.

Mark Serbu, designer of the RN-50, addresses a catastrophic failure experienced by Kentucky Ballistics. He reassures customers about the RN-50's safety, attributing the incident to counterfeit or over-pressured ammunition. Serbu highlights the rarity of such events and emphasizes industry transparency, noting that his company has produced approximately 1,400 RN-50s since 2016 with hundreds of thousands of rounds fired without issue.