Obviously, somebody finally got through to the producers, because the guns did get better in the later seasons. Rick still uses the Python, but we started seeing more sensible guns for fighting zombies, including a lot of variations on the AR-type platforms and a bunch of semiauto handguns. They also have a lot of AK-47 variations, probably because of the "mean" look of the gun. The Governor (the worst of the bad guys) used the Steyr AUG, which is a very distinctive looking firearm. I know for a fact that the management at Steyr wanted to stay out of the whole zombie thing when it was in vogue, and they were a bit upset that their gun showed up on The Walking Dead. But when demand for the AUG soared, it was okay.