clandestine
AR-15 Savant
Did you experience any malfunctions because it was dirty? Any change in pull weight or feel? I'm guessing no.
So you had questions, but are now answering them yourself after being shown fouling does accumulate in the FCG pocket.
Yes, for aftermarket "Pack" Units they can fail with fouling, mainly because almost all of them are single stage and have little room for fouling.
Wayne, I apologize for my comments bringing this into your thread.