Yeah, I think Packing.org is one of the places I have seen it as well, among the MANY places it has been posted. I would probably give credit for the photo to Packing.org by default since they are the biggest and most popular guy on the block (and rightly so).
Interesting you should mention Caswell\'s. That is the closest range to me and generally, where I go to shoot. I have been there MANY times and, in fact, took my CCW class there. I am planning on going back and taking their UT/FL combined class this Fall. They are a great bunch of guys and I recommend them to anyone looking for an indoor range, basic shooting, tactical or CCW training in the Phoenix/Mesa, AZ area.