The primary reason the military went to chrome lining is not to save a GI from having to clean his weapon more often so it wouldn't rust or corrode.. The military weapons were full auto and shooting it that way could wear out a barrel in less time. Chrome lining would extend the barrel life of a military full auto weapon.
If you are a recreational AR-15 shooter who takes good care of his rifle you wouldn't notice any difference for years.
Have a nice day at the range
NRA Life Member