Yeah yeah, I know about the lever in the right position and the bolt carrier removed. (But thanks for asking.) The darn gas tube just won't budge, and with the handguard in place, there's no place to get any leverage to grab the gas tube and yank it out from the rear. The handguard is boogered, which is why I am trying to remove it. One idea I had -- gently cut the handguard away, and then I will have exposure to the gas tube to yank it out. Any thoughts?