This is a game that has bull pups with folding stocks. Even a rudimentary understanding of firearms would make one ponder as to how, or better yet why.
What weapons are you referring to?
Only one i could find is Sernopal vz/88V assault rifle and even it is bull pup only in the picture(and the picture even shows how)
If you look at the picture in Arsenal it shows a folding skeleton stock right behind the magazine. You can see the hing... which now that i look at it i see it's on the left side of the weapon which is even stranger.