Ok, I'd like to think I have an intermediate skill set and ability to work on ar's (again I'd like to think). I'm having a damn time removing an fsb off an old Bushy. I've hit it with bouts of penetrating oil (and numerous other fluids) and the rubber mallet more than I can emotionally and physically express. I'd love just to take the Dremel to it, install a low pro block, but I can't (not my rifle). Any tricks any of you guys can give me on how to break this pain in the rear free?. I have all three pins off...can't get the gas tube free though