Knights Armament Company Sandcutter AR BCG Autopsy

This video focuses on a physical swap and gas key replacement for the KAC Sandcutter Carrier. It delves into the technical aspects of modifying or maintaining this specific firearm component, suggesting a focus on gunsmithing or detailed firearm component analysis.

This video details the extensive quality control issues found in a Knight's Armament (KAC) SR-15 'blem' lower receiver. Multiple critical dimensions, including bolt catch pin holes, takedown/pivot pin holes, hammer/trigger pin holes, and the magazine well, were found to be out of spec. The owner opts for a custom repair involving drilling and tapping for a threaded bolt catch pin, highlighting the need for meticulous inspection even on high-end firearms.

This YouTube video features a physical inspection of five Knight's Armament Company (KAC) Bolt Carriers and one Lewis Machine & Tool (LMT) Enhanced Bolt. The content focuses on the detailed examination of these critical firearm components, likely highlighting their design, construction, and any notable features. This type of video appeals to firearm enthusiasts, gunsmiths, and those interested in the intricacies of AR-15 platform components, particularly those from high-end manufacturers like KAC and LMT.

This YouTube video focuses on the Knights Armament Company SR-15 lower receiver, specifically highlighting its oversized bolt catch pin bore and takedown bores. The content likely delves into the technical specifications, potential benefits, or troubleshooting related to these specific features of the SR-15 lower.

This build showcases a 9mm FX9 AR Pistol modified to resemble the DEA Colt SMG. Key upgrades include a Magpul MOE SL handguard, an 8-inch barrel with a recessed muzzle device, and a Shockwave Blade 2.0 pistol brace. The design inspiration draws from the classic Colt SMG's integrally suppressed barrel and KAC handguard.

This video, part 5 of a series, documents the rebuilding and testing of a fire-damaged AR-15. The firearm was reassembled using original parts where possible, with replacements only occurring after malfunctions. The goal was to assess the usability of components after exposure to fire. The video highlights the generosity of the firearms community through donations that funded necessary repairs and shipping. While the repaired rifle is deemed unsafe for serious use, the owner is provided with a new rifle, emphasizing the safety and well-being of the owner and his family. The video also shares a link to how the situation was discovered and provides links to previous parts of the series.

This video details the diagnosis and repair of a feeding issue on a Sons of Liberty Gun Works East India upper receiver. The root cause was identified as a sharp burr on the barrel extension's feed ramp, causing rounds to jam. The solution involved polishing the feed ramps and adding a secondary bevel, replicating Colt's design, which successfully resolved the malfunction.

This video demonstrates the internal mechanics of an AR-15 bolt carrier group using cutaway models. It highlights the importance of internal bore dimensions for gas system efficiency and explains how to diagnose potential issues like gas leaks. The demonstration covers the cycle of operation, critical seals, and common manufacturing defects, offering advanced insights for AR-15 maintenance and troubleshooting.

This video provides a detailed autopsy of a faulty AR-15 Bolt Carrier Group (BCG). The analysis reveals critical manufacturing defects including an undersized bolt tail failing gauges, excessive firing pin protrusion causing pierced primers, an oversized firing pin hole, and an oversized cam pin hole leading to headspace issues. These flaws significantly compromise the BCG's function and reliability.

This video demonstrates a specialized technique for swapping an AR-15 rear takedown pin without full firearm disassembly. It highlights the use of a custom-fabricated tool, often made from a 1/16 inch Allen wrench, to depress the detent. The method allows for efficient pin replacement, particularly useful on rifles with staked castle nuts, by leveraging the old pin to guide the new one into place.