Hello, I too am having a rough time getting my factory railed gas block off of my M&P 15OR. I was unable to remove it myself so I took it to Gander Mtn to see if their gunsmith could help my situation and sure enough they were also unable to remove the gas block taper pin. Hitting from ejection port side to non-ejection port side. My gas block got pretty beat up after the gunsmith worked on it, very scrathed. I now need to get this one off and need a replacement. I called S&W to tell them about my situation but they said they are off until January 2nd so I should wait until then to send it in. I hope they will be able to get the factory block off and get me a replacement on there. I heard these taper pins were tough, but mine would not budge. Not for me or the gunsmith. I now have a beat up gas block. Scratched does not describe how bad this thing is beat up. I am not a happy camper, all I want is to get this thing off so I can install my YHM free float forearm, but now I need a new gas block too. Any idea on the average turn around time from S&W factory services?