You can cheat if you upload pictures to facebook. When you view the detailed picture, right click on it and select "Copy Picture URL" or something to that effect from the mouse menu, come back here, paste it.
I doubt that posting pictures of gun related things on Dorkbook will do good things for you. Just a thought.
This forum doesn't have a gallery. However, another forum I frequent does, so I dump a picture into the gallery and can link from there.