Melting down a PSA upper and the FN barrel it rode in on (VIDEO)

Eric at IV8888 continues their rifle meltdown series with a Palmetto State Armory cold hammer forged upper that uses an FN barrel made from what is referred to as “Machine Gun Steel.”

Strapping the M-Lok slathered upper into a registered machine gun lower and stoking it with a steady diet of Fiocchi .223, the gun starts to rock and roll as the molly vanadium barrel gets a rapid break-in. However, (spoiler) it seems like the gas tube tanks after about 430 rounds cyclic.

In the after-action report, it looks like everything is still good to go with a new gas tube, with the classic theory of Eugene Stoner intending the tube to be the “fuse” of the AR system somewhat validated.