Rifling 5! (Re-edit 2)

This guide, presented by Josh from AT3 Tactical, explains the fundamental concepts of AR-15 barrel rifling and twist rates. It details historical methods, modern manufacturing processes like button rifling, cut rifling, and cold hammer forging, and clarifies how twist rate impacts bullet stability based on weight. The information is presented with an emphasis on practical application for firearm owners.

This video details significant design improvements and repairs made to the AK-50 V3. Key updates include a new two-piece firing pin design to address breakage issues, a revised takedown lever for easier disassembly, and an improved handguard retention system using a threaded insert. The video also covers the importance of features like fluting on the firing pin for weight reduction and a blowout hole for safety in case of primer piercing. The presenter emphasizes the iterative nature of firearm development and the importance of addressing potential failure points to enhance reliability and safety, especially with a powerful cartridge like .50 BMG.

This video details the process of repairing a chopped receiver section from a Star Z70 parts kit. Mark Serbu, a gun designer, demonstrates how to fabricate and weld in replacement metal to restore the structural integrity and form of the receiver. He emphasizes using an expanding mandrel for alignment and copper flashing to protect against welding spatter, while also discussing techniques to minimize heat distortion and achieve a functional repair using 'caveman tools' and optional CNC machining.

This video provides a detailed, step-by-step guide to reassembling an Atlas Erebus 1911DS pistol after it has been fully disassembled. The instructor, while not a professional gunsmith, shares his practical approach to putting the firearm back together, highlighting common challenges and solutions. The guide covers the reinstallation of all major components, including the trigger, grip, fire controls, hammer, safety, and slide, emphasizing the importance of proper fitment and lubrication. It also touches upon the unique hand-fitted nature of Atlas firearms and the availability of builder kits.

This guide details the process of swapping the recoil spring on a Girsan Match X Comp pistol. It involves disassembling the slide and comp, using a small Allen wrench to release the spring, replacing it, and reassembling the components. The instruction emphasizes the need for some force during disassembly and careful alignment during reassembly.

This guide details the process of smoothing the action on a Bear Creek Arsenal BC-10 bolt action AR chambered in .308 Winchester. The author addresses initial issues with a stiff and locking action by performing a deep cleaning and gently polishing the bolt lugs to simulate break-in wear. The process involves careful disassembly, cleaning, light polishing with a buffing wheel, lubrication, and reassembly, aiming to improve the overall smoothness of the bolt operation. The video also touches on optic mounting and initial range testing after the modifications.

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.