And in the case of the "test" in question, rust was not an issue.
No amount of chrome will mitigate the issues experienced. If there were enough debris to prevent extraction, it wouldn't have chambered fully in the first place.
Chrome doesn't magically make ammunition chamber past heavy fouling or debris and then allow extraction whereas a non-chrome chamber wouldn't.
Heresy!!! Chrome lining (provided you can't make it out of titanium or stellite) is the answer to all...even diabetes, athlete's foot, social anxiety, and (according to AGG) erectile dysfunction!
You, sir are not awaited!!!!
Witness my chrome!!!
I suppose this the one instance that standard internal piston may win out as the gas vent holes are able to blast mud off the side of the carrier when the dust cover is open.
HK spring buffer?
A real mud test.
Mud makes firearms look cool: