The image on on Shur Fine Guns is a gun modified to fire backwards, and the image on Backwards-Firing Gun is a gun going off in someone's face. They each illustrate the other trope better, so swapping them around would be a good idea.
Hmm, the old thread for Backwards-Firing Gun seemed to lock in on having a Spy vs Spy pretty quickly, and even though an actual Backwards-Firing Gun pick was suggested, it wasn't included on the crowner. I think there may be some Fan Myopia at work on that. It ought to be reopened, since just a gun going off in someone's face when they fired doesn't really demonstrate the firing backwards aspect.