Does not fit mega arms upper - V Seven Extreme Environment Gas Tube

Does not fit Mega Arms uppers. The description did not say anything about not fitting this upper (both on OpticsPlanet and V Sevens Website), so I thought I would be good. I have to use a standard gas tube. This item arrived promptly when I ordered it in March, but had to wait several months on a barrel. Since OpticsPlanet had almost a year wait time on the barrel (after first posting it was only going to be a month) I had to order from someone else, but that put me outside the 30 day return window for the gas tube when I found out things would not fit. I now have a very expensive drinking straw.