Get out plenty of socks to keep the barrel and receiver clean. Cutting the delta ring throws off a bunch of aluminum dust. No big deal. Wrap socks around as if prepping for surgery, duct tape it, then use a dremmel to cut mostly through the delta ring at two points that are on opposite sides of eachother (halfway around). Take a flat head screw driver to pry and break it free. Here are some pics of prep and cut and finished product.
https://www.m4carbine.net/picture.ph...pictureid=3159
https://www.m4carbine.net/picture.ph...pictureid=3158
https://www.m4carbine.net/picture.ph...pictureid=3160
