Quote Originally Posted by ray1970 View Post
No need to remove anything other than the roll pin that secures the gas tube and the gas tube itself.
^This-soak the gas block/tube junction with some bore cleaner or Kroil and let it set a while. When you get the pin out gently rotate/wiggle the tube out of the block. Push the tube into the upper a bit until it clears the block and retaining ring and remove.