basically danny, the ego barrel is a 2 part barrel (ie the front screws into the back, which inturn screws into the gun) in some cases the front and back can stick together - it can be undone again, but can be pretty hard to do so. and im guessing this is what the op means.
Basically the owner who had the gun before had overturned the threads, does not affect the straightness of shooting or anything, its just the barrel don't come in 2.