There is no gas system, it is an inertia driven system.
What area are you calling the "tube"?
If your talking about the action spring "tube", you paid $1300+ for the gun, it takes mere minutes to break it all the way down to a sum of its parts and thoroughly clean.
I don't understand why some people won't do a thorough cleaning after every use, but then again, these are the same people who complain when they have a FTF.
I have had one FTF and it was my own fault. I let my SBE II rest on a blind brushed with palm grass, and a piece of it broke off and got down in the trigger group, I had a single shot until the end of the hunt. In 3+ years that is the only failure to fire out of any of my Benelli autos.
For the record, if I fire 1 or 100 rounds, I thoroughly clean the gun I was using, period. Others have routines that work for them, but this is a proven method that I have convinced everyone I hunt with to use during last season, and FTFs have completely gone away.