I went out and shot some rock today with my nef 10ga and when I came in to clean it, the barrel rocks side to side just alittle, open and closed, less closed. Its a factory gun so it should have been fitted right. I have shot 2 boxs of differnt steel shot and 20 or so turkey reloads, all loads are loads out of many name brand books. I just woundered if it was going to hurt anything or not, I put a peace of note book paper on the pivot pin and it locks up like it should , so its about .004" loss. Any ideas? Maybe the factory didn't set it up right or maybe the frame streched a little, just dont know.