Seriesly, they always have one AK47 for the cameras, even if they have to bring one of their own. I always study the guns in the background, and they're usually worn-out single-shot shotguns or .22s like you'd find on old farms.
I've been given junkers like that by relatives who didn't want them around. Me neither, especially since they couldn't be salvaged. I'd either crush part of the frame in a big vise, or cut through it with a milling machine. Then into the trash, where someone might get a momentary thrill, or shock, until they realize what was done.