Generally speaking stands will be made from 6061 (more rigid) 6063 (less rigid). Both of these alloys can be welded with 4043 for maximum as welded strength. These are standard readily available structural aluminum alloys.
I used to shoot birds for a cat when I was young. Didn't really need to she would bring home grown rabbits for her kittens. They love to hunt but they think they are in charge.