Do you have the gas tubelock rotated into the correct position? It should be slightly upward. If that is a yes try this, put a generous helping of CLP on the gas rod and let it soak in for a few minutes. Then try to carefully, and I do stress carefully, coerce it out with a rubber dead blow hammer or the like. If it dosen't start to give DO NOT FORCE it, you don't want to take a chance and break anything. Sometimes SKS's will develop a gas leak which in turn will crud it up even more. I will do some more research on the problem and post anything else I may find.