The above pic is via TACBLOG and if you didn't notice it let me get you up to speed. That G36 has a MagPul Mag sticking out of it. If the G36 is now MagPul compatible (or more likely the case, its a 4th Gen MagPul mag that will work in H&K products) then the USMC can come off the MagPul ban and let Marines carry magazines that work.
Note: Some are saying that this is just airsoft at work. If it is then this guy is hardcore into it. I'm still betting its the latest gen MagPul.