Home Shop Rifling - Part 2

Mark Serbu demonstrates a home-shop button rifling process using Chinese and Ukrainian rifling buttons on 4140 and 12L14 steel barrel blanks. The video details the use of a hydraulic press and Moly grease, concluding with a comparison of the 4-groove rifling from the Chinese button and 6-groove from the Ukrainian button. Serbu provides expert insights into material selection and the practicalities of DIY barrel making.

Adam Waineau of Ballistic Advantage discusses the critical factors in manufacturing accurate rifle barrels. He emphasizes starting with high-quality, match-grade barrel blanks with tight tolerances and maintaining concentricity throughout the machining process. Waineau also clarifies that barrel weight is not a primary determinant of accuracy, with factors like sequence of fire and heat affecting performance.

This video highlights a small but significant improvement from SOLGW (Sons of Liberty Gun Works) – a new grip screw for their AR-15 platform. The screw features a combo head compatible with both 3/16" hex drivers and flathead drivers, is constructed from durable 4140 Steel, and finished with a Black Oxide coating for corrosion resistance. SOLGW emphasizes their commitment to continuous fine-tuning and readily available parts, stating this screw will be included in all their firearms, lower parts kits, and offered to OEM partners. The focus is on enhancing an already functional platform with quality components.

This guide details the process of fitting and demonstrating the bolt carrier and front trunnion for the AK-50 project, based on Brandon Herrera's February 2021 update. It covers the redesigned trunnion geometry, the modular bolt carrier cam groove inspired by the Stribog, and the functional demonstration using a 3D-printed bolt mock-up. The information is presented from the perspective of the lead designer, offering high-level technical insights into the project's development.

This video introduces the new Bullet Proof® Adjustable Lo-Profile AR-15 Gas System from Wilson Combat, presented by Paul Levy of Brownells. The system features a low-profile gas block made of 4140 steel with an integrated stainless steel gas tube. Its key feature is a slot-head screw allowing adjustment of gas flow through 16 positive-click settings, enabling users to optimize for different ammunition. The self-cleaning mechanism scrapes out carbon fouling with each adjustment. Setscrews secure the block to pre-dimpled barrels, and the straight gas tube simplifies installation. The system is available with various gas tube lengths and for different barrel diameters.

This video provides an in-depth update on the AK-50 project by Brandon Herrera, focusing on design iterations and manufacturing challenges. Herrera, the lead designer, details the shift from a milled receiver to a stamped sheet metal design for improved AKM aesthetics and production efficiency. Key technical discussions include the redesign of the ejector mechanism to a traditional 'shark fin' style and the use of 4140 steel for the trunnion. The update highlights the 'skunkworks' R&D approach, emphasizing creative problem-solving on a budget.

This guide details the complex process of converting a lathe into a 12-barrel blank-firing gun, as demonstrated by Mark Serbu. It highlights the critical engineering challenges, including precise alignment, CNC control, and the application of PID theory to overcome firing inconsistencies. The project emphasizes safety and legal considerations, focusing on blank ammunition to avoid machine gun manufacturing regulations.

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 expert-level analysis of a catastrophic failure of the Serbu RN-50 rifle, presented by the firearm's designer, Mark Serbu. The examination focuses on the severe damage to the receiver, breech cap, and barrel assembly, offering insights into potential failure points and the effects of extreme forces. The analysis also touches upon the ammunition used, specifically SLAP rounds, and their potential role in the incident.

Mark Serbu, a gun designer, addresses the RN-50 blow-up incident involving Scott from Kentucky Ballistics. Serbu reassures customers that the RN-50 is a safe design, attributing the incident to a counterfeit and faulty ammunition round. He emphasizes the importance of sourcing ammunition carefully and highlights the rifle's extensive safe operational history.