High Exposure, LongEye, and Sinister pretty much covered it all. A vice and tape are your new best friends. Use some wood blocks, lead vice inserts or if you’re in a pinch a bunch of layers of aluminum foil to keep from scratching up your barrel if you’re one of those guys that get torqued up about skinned up guns. Using a vice is is REALLY IMPORTANT if you decide to use an angle grinder. Those things are excellent tools for removing things very quickly wether it’s an unwanted FSB, barrel or gas tube metal, and any errant body parts that you interpose into the path of it’s rapidly spinning disk.
Oh, don’t forget to wear your frickin eye pro or better yet a full face shield. Dremel cut off disks and those grinder disks exploding at high rpms will make you even uglier than normal and blind.