Naw, ya'll...that's one of them there "aero-dynamical" sway back mag/clippy things...fer when you have to run away cause the other guy didn't stop shootin' when you called time-out! MG
I have seen that picture before, everyone here knows that it is impossible to install a mag in an ar backwards. Somone is just having a little fun with us gun nuts.
I was trained several Pvt.'s in Marksmanship and you would be supprised how many of them when trying to rush will put the mage in backwards or upside down and about half the time they do stay.