I'm building one of those concealed gun wall mounts that looks like an American flag, and I want to put in my AR, pistol, and in future a tactical shotgun. Eventually I see myself buying the Mossberg 500 because I've heard lots of good things about it. So instead of having to take a trip to the store and risk just buying it on the spot and angering the Mrs.... I figured I would ask here to see if anyone could measure it for me so I know that I am making it long enough. With my AR it should be a good width but I just wanted to make sure.