You probably could stuff a short shotgun into it as well. I've crammed a couple of rifles into mine, but I did have to break them down a bit to make them fit.
It's pretty well built. I beat the snot out of mine by jamming as much junk into it as I can when I head out and it has held up remarkably well. Sparrow had one come apart on him, but Dave's and Maxpedition stood behind it and replaced it.
It has large zippers on it that can be locked together. I drilled through the plastic protective coverings on the ones on mine to enable me to lock it up a bit easier.
You can't really go too far wrong with these cases.