This video details the process of building an AR-15 upper receiver, focusing on the critical steps of installing the forward assist, ejection port cover, and the barrel assembly. It emphasizes the importance of precise barrel installation using a thermal fit method and the correct torque specifications for the barrel nut, highlighting techniques for ensuring reliability and accuracy in a firearm build.
This video, the second part of the SmythBusters series, features Bill Geissele of Geissele Automatics addressing the myth of galvanic corrosion in AR-15 firearms. Geissele, drawing on extensive experience with machinery and firearms, explains that the direct contact of bare steel and un-anodized aluminum, which is required for galvanic corrosion, is rarely present in an AR-15 assembly. He shares that after nearly a decade of using Geissele's Super Modular Rail handguard and aluminum barrel nuts, he has found no evidence of such corrosion. The discussion also touches upon the appropriate use of lubricants and anti-seize compounds in threaded joints.
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