i have a marlin 336w in 30-30, and am looking to mount a peep sight on the receiver. i figured i would need to get the semi-buckhorn sight out of the way some how and the marlin website says that it came with a folding rear sight. maybe i am overlooking something but i cant see any type of a hinge or any way that this thing is supposed to fold down. am i missing something really obvious, or did i get a non-folding sight somehow?