If others have already discovered this and it is not newsworthy please disregard this message
Anyway, I finally opened my US TR Fortress Maximus and I discovered something that is not mentioned in the instruction manual. While I was applying the stickers and raised the double barrels cannons/guns on the legs I saw something inside both cannons/guns. I flipped the hidden part out from each gun and low and behold it looks like a gun handle. I detached these two cannons/guns from the legs and Fortress Maximus now has two guns to hold! There is a tab on each of the handle such that both guns can be secured attached on the fists. So, yes, it may not be as cool as some of those canons/guns from 3rd party add-on sets but at least Fortress Maximus has two guns to hold. The drawback of this feature is that you may break something when you detached or reattached the double barrels gun on the legs (so if you attempt to do this and broke something don't blame me
).
(Now that I think about it I have saw pictures of the Japanese Fortress Maximus which have shown this feature. Why doesn't Hasbro make this feature known??
)