Air Venturi Avenger Barrel Band

I'd assume closest to the muzzle while still being able to take off the fill cap so that the end of the barrel shroud stays aligned with the rest of the gun better. It also could help if the shroud and long air tube are slapping each other with shots at higher regulator pressures.

I bottle modded mine like 2 weeks into owning it so someone who has left theirs stock could give an answer too.

I do know that there are multiple places to get bands for the stock tubes, and I'd recommend the wider the better. AE Swede makes some or this one if you put a tactical stock on exposing the short tube.

Ebay has some by a seller I've bought from too. Good stuff.