Actually, the barrel comes off with 1/4 turn, so it would take longer to dig my squeegee out of my pocket than it would to clean the barrel if I do get a break!
That is one of the reasons I like the A-5 so much, the easy on/off barrel. I don't know why other manufacturers haven't done something similar. I can take the flatline off and flip it in a second or two. I typically run a squeegee through it after every game since it is so easy to do.