I wanted to take a better look at this photo and see if that was the case. I found a slightly larger version on another website, downloaded it, and opened it in Photoshop. After blowing up the image even further and examining it, I can see no indication of another, correctly inserted, magazine in the weapon. After blowing it up in the fashion I did, it’s clear that it’s either one incorrectly inserted magazine, or the photo has been altered to make it appear that way (I would vote for the former).

To address the fact that the magazine appears to be so long, I found the following video on youtube. As you can see from the video, an incorrectly inserted magazine will go into the magazine well, but will not insert fully. The result is a partially inserted magazine that protrudes from the weapon much farther than a properly inserted magazine.

http://www.youtube.com/watch?v=0VWIeK-LQc0