So, I've got my POF lower and the springs and detent pins for the selector switch and the takedown pin. There is a long spring and a short spring, and a smooth-sided detent and one with a point on one end and a groove in it. JGun told me the that the detent with the groove is for the selector, and that the pin goes point towards the switch and grooved end towards the spring. So, here is my dilemma: I thought the long spring went with the selector detent, but the circumference of the short spring more closely matches the point detent. I think I have my answer, but if I put the smooth detent with the short pin it would just sit inside of it - lol <dontknow>