as Ross said, the lower reciever just hooks in it takes no stress and does nothing other that release the bolt. the recoil as he said sends it straight back, the problem is that this shitty plastic they use, on all guns. the way it slides on the back of both recievers the little fingers or claws, are thin and well plastic, enough force upon them, or even any kind of sideways force would snap those off. heres a couple pics>>>
