Use this to get the nut off that's threads directly to the barrel https://www.amazon.com/Round-Holder-1-Inch-Diameter-Capacity/dp/B07539CTQQ Use a piece of appropriate gauge sheet metal to take off the nut that mounts to the jacket if I remember right I used ont of these https://www.lowes.com/pd/Simpson-Strong-Tie-Wood-to-Wood-Tie-Plate/3083383?cm_mmc=shp-_-c-_-prd-_-bdm-_-ggl-_-LIA_BDM_103_Roofing-Gutters-_-3083383-_-local-_-0-_-0&ds_rl=1286981&gclid=Cj0KCQjw8uOWBhDXARIsAOxKJ2Fuy4Zjuimh2NOmWYHtBXK1LH90hGj...
Before you take it apart set the barrel upright with the last 3-4 inches of the muzzle sitting in PB blaster your preferred penetrating fluid for at least a day you're gonna need to put it in a padded vise and use quite a bit of force and do what mark Novak did with a rod to catch the nut and springs and all because they absolutely will go flying and most of the barrel/jacket parts are unobtanium