[daddy6stringer]

They do fit...as where there is a will there is a way, but it has to be at least the double pouches. And it doesn't fit all that well. I am sure some people have done it with success, but I do not find it all that effective in the end.
Keep in mind by putting G36 mags in AR pouches, you run the risk of breaking off the tabs that clip the mags together. That being said, I am sure some of the more experienced G36 users have come up with some interesting ways to modify kit to compensate for that.
Your best bet is the G36 mag pouches. The downside of being a G36 user is that without the mag well adapter, you are pretty much stuck getting separate pouches and whatnot than the Armalite users. Typically this ends up being more expensive...But if you are getting a G36, generally you are not doing so because it will be an inexpensive AEG solution. I love my G36, but AR kit costs less (generally speaking, as there are plenty of people who use them), and is easier to get parts for...