2 PSA Upper Receiver Autopsies - Part 3/3

This video details the assembly and testing of a custom AR-15 bullpup rifle using the A3 Tactical Triad Bullpup Chassis. It covers integrating a Palmetto State Armory lower with a Brownells BRN-180 upper and highlights the selection of a True North Concepts foregrip over the Die Free Tiger Claw for durability. The build is then taken to an outdoor range for live-fire testing, demonstrating its cycling and ergonomics.

This video provides a detailed autopsy of two Palmetto State Armory (PSA) AR-15 upper receivers, revealing critical assembly flaws despite passing basic checks. Key findings include misaligned barrel extensions ('clocked' barrels) and potentially over-torqued barrel nuts, issues that can affect feeding and overall firearm function. The analysis highlights the importance of thorough inspection beyond initial gauging, especially for budget components.

Avoid common pitfalls when building an AR-15 by planning your rifle's purpose and budget first. Prioritize quality for critical components like barrels and BCGs, and avoid overspending on standard lower receivers. Use proper tools and techniques for barrel installation to ensure accuracy and longevity. Focus on functionality over aesthetics, and be aware of potential issues like receiver slop.

This guide details the cleaning and maintenance procedures for various adjustable gas blocks, including screw-style, JAKL, and Riflespeed models. It emphasizes the importance of regular cleaning to prevent carbon lock and ensure reliable firearm function, especially when using suppressors. The guide provides specific steps for disassembly, cleaning, and reassembly, along with recommended maintenance intervals.

This video provides an in-depth analysis of two PSA AR-15 upper receivers, focusing on critical components like muzzle device torque, barrel thread concentricity, gas port size, and bolt carrier group (BCG) tolerances. While the uppers are deemed decent for their price point (around $300), potential issues like slight over-gassing and the use of extractor O-rings are noted. The analysis uses specialized tools and adheres to technical standards, offering valuable insights for builders and enthusiasts.

This video from Palmetto State Armory showcases a 300 Blackout pistol build kit, ideal for those looking to assemble their own firearm, especially for suppressed use. The kit includes an upper receiver with an FDE Hex Rail and a lower parts kit, simplifying the process for builders. The PSA Representative highlights the versatility of the 300 Blackout caliber and the ease of completing the build.

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.