Ok, lemme try to break the discussion down for you, since you obviously have serious problems with text interpretation.

All I said at the beginning was that FOR ME, the term assault rifle made sense, given the story of the sturmgewehr (yes, which comes from the STG-44..) and the literal interpretation of its name, and why it was the reason why I (as in ME, JUST ME, PERSONALLY) believed the AR stood for Assault Rifle, that's all I said.

Then at some point the discussion turned to the US military using AR-15's or not, I have no qualms in admitting I didn't know the M4 had a different gas-system, but what I said in this post to which you just replied, was to try and explain the point that even though the platform might be different, they essentially work the same, they fire the same round, they have the same lethal potential, and they operate mostly the same, since they're both based out of the same platform.

So these are two different discussions you see? again I know it's difficult for you to understand, but I have some crayons around here somewhere, I could draw something for you if it's going to make it easier.