Videos tagged with Bolt Tail

This video provides an abbreviated autopsy of a KAK K-Spec bolt carrier group, identifying significant gassing issues. The inspection reveals leaks at the carrier key and bolt tail, an oversized bolt tail opening in the carrier, and an improperly machined internal transition that can damage gas rings. The dual ejectors and weak extractor spring are also noted as potential contributing factors to poor performance.

This video announces the release of the School of the American Rifle's AR-15 Bolt Carrier Group (BCG) and Gas System Gauge Set. These gauges are designed to measure critical dimensions of the BCG, including the carrier body, bolt tail, and gas key, to assess efficiency and proper function. The set also includes pin gauges for carrier key alignment and a gas path gauge to check for obstructions. While some specialized gauges are not yet available due to manufacturing challenges, the released set aims to provide users with a deeper understanding of their AR-15's internal workings and potential gas system inefficiencies.

This guide, presented by Chad Albrecht of School of the American Rifle, details the proper cleaning of an AR15 Bolt Carrier Group (BCG). It emphasizes avoiding aggressive scraping tools that can damage critical dimensions, instead recommending chemical solvents and non-abrasive tools like cotton swabs and nylon brushes. Proper lubrication is highlighted as more critical than extreme cleanliness for maintaining the BCG's function.

This video provides a critical, expert-level inspection of a problematic AR-15 Bolt Carrier Group (BCG) by Chad Albrecht of School of the American Rifle. The analysis details numerous manufacturing defects, including an undersized bolt tail, excessive firing pin protrusion, oversized firing pin and cam pin holes, and a failing headspace check. The content highlights the importance of precision gauging in identifying critical failure points that impact rifle reliability and safety.

This video provides an in-depth physical inspection and gauging of five Colt Bolt Carrier Groups (BCGs) from various date ranges, including M16A1 kits, a Colt H-Bar Sporter, and a Colt Commando. The instructor meticulously examines each BCG for wear, corrosion, and dimensional accuracy using a variety of tools and gauges. The analysis covers critical components like the gas key, bolt tail, extractor, and firing pin, offering insights into the manufacturing tolerances and longevity of Colt BCGs across different generations.

This video provides a detailed physical inspection and partial disassembly of an Advanced Armament Company (AAC) Bolt Carrier Group (BCG). The instructor examines the nickel boron and phosphate components, checks staking, and performs various tests including gas ring fit, bolt protrusion, and magnetism. The borescope inspection reveals some machining marks and inefficiencies in the gas ring area, offering insights into potential wear patterns and manufacturing quality.

This video provides a detailed inspection of a Lantac Bolt Carrier Group (BCG) with a nickel boron finish. The instructor meticulously checks various components, including the bolt, carrier, gas rings, firing pin, and extractor, using specialized gauges and a borescope. Key findings include a smooth finish, slightly gas-inefficient dimensions, and a rounded cam pin designed to reduce receiver wear, though the instructor expresses skepticism about its effectiveness.

This comprehensive physical inspection of the Forward Control Designs (SBCG) Bolt Carrier Group highlights its robust construction and attention to detail. The review covers critical checks including gas ring tension, firing pin protrusion, extractor function, bolt tail and carrier bore gauging, and headspace. The use of Aux Ox carrier key screws and Psionics staking method are noted for their security. A borescope examination reveals a very smooth internal finish, particularly in the gas ring and bolt tail runs, indicating high manufacturing quality. The reviewer concludes with a highly positive assessment, noting the BCG passed all checks with flying colors.

This guide details the use of the Kley-Zion CRT carbon removal tool for AR-15 and M4 bolt carrier groups. It demonstrates how to effectively scrape carbon buildup from the bolt tail, firing pin, and the interior of the bolt carrier, particularly on direct impingement systems. The tool's adjustable tension is highlighted as a key feature for efficient carbon removal, making cleaning easier and more thorough.

This guide details the process of replacing worn gas rings on an AR-15 bolt carrier group (BCG). It covers diagnosing worn rings using the 'gravity test,' disassembling the BCG, carefully removing old rings with dental picks, installing new rings with staggered gaps for optimal sealing, and reassembling the BCG. The process concludes with a repeat of the gravity test to confirm successful replacement. Instruction is provided by an experienced firearm builder and maintenance instructor.