So...on assembling some fancy dancy alloy upper receiver (non 7075), I have to thermal-fit the barrel. I've done this at least 2 dozen times.
On this attempt, I use a heat gun and fit the barrel. I leave the barreled upper to sit and cool. Upon return to torque the barrel nut, much of the lovely black satin finish is now matte, powdery and gritty and is flaking off to the touch.
Previously, I have been told by more than 1 mfg that when messing with anything outside regular 7075, that anodizing can get tricky, and while the dye may not take as well, it's still hardened and corrosion resistant.
Can anyone confirm that? Or did I completely f**k something up on the thermal fit and compromise the upper?
Just trying to figure out my next play be it Cerakote, re-anodizing, or just driving on with a quick rattle can job.
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