Quoted:
Quoted: outstanding. now the next time you hear someone say that Parkerizing the barrel intact doesn't harm anything you can throw in some first hand contrary knowledge.
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So are you saying some park solution that remained between the FSB and barrel after the park process caused the corrosion?
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The park solution also contains water and is usually dried prior to being oiled.
The discoloration is caused by a lack of atttention to detail by whoever parkerized it.
The orange/brown stuff is rust.
I have parkerized fal, AK, AR, Galil, G3 and others with the gas block installed, or in some cases with the reciever and barrel assembled, and never had an issue.
The key is to make damn sure you get all the water/park solution out of it prior to oiling or painting the assembly.
A good air compressor with a standard air nozzel works fine if you can keep water out of the air lines.