SmythBusters: Galvanic Reaction & Your AR-15 - Part 2

As a supplement to our other SmythBusters video with Steve and Caleb (linked below), Bill Geissele of Geissele Automatics shares his thoughts on the myth of corrosion caused by galvanic reaction between the barrel, barrel nut, and upper receiver of an AR-15. Full disclosure: Bill is not a chemical engineer, nor does he play one on TV, but he has a lifetime of experience working on motorcycles, industrial machinery, and firearms. (And he explains things in terms that even those of us who barely eked out a Gentleman's C in high school chemistry can understand!) Bill supports what Steve and Caleb said: you pretty much never have bare, un-anodized aluminum in contact with bare steel on a gun, so the chances of galvanic corrosion occurring are nil. After nearly a decade of real-world experience with the Geissele Automatics Super Modular Rail handguard and aluminum AR-15 barrel nut, he has seen NO evidence of galvanic reaction. Bill also has some observations on the use of lubricant and anti-seize compound in threaded joints.

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