I noticed the other day when i was cleaning my dpms 260 that when the carrier key on the bolt carrier group slides over the gas tube it seems to push the tube down and left slightly. And i can hear it slide in the carrier key. There is no resistance when it goes over the gas tube and it only very slightly pushes it down and left but i can see it. Is this ok or should i try to adjust the gas tube? Or can you adjust the tube? The gas tube is aligned with the barrel nut perfectly and there is no resistance with the tube going through the barrel nut so i know the barrel nut is not pushing it out of position.