Glad you got it cleaned up satisfactory. If you do want to go deeper, the barrel is not super hard to remove, just takes some patience and maybe a home made tool. The fore end tube screws onto a stud that is per a attached to the front of the receiver. It acts as a nut to hold the barrel extension to the receiver. There is a cross hole in the fore end tube near the muzzle end. Maybe you can break the tube free with a rod or pin punch that fits through this hole. If it is too tight and bends the rod, you might need to make a tool to support the rod. I always have some yard sale open end wrenches around for projects like this. Take a wrench that will fit around the fore end tube and drill a proper size hole through the sides of the open end so that your rod will go through both sides of the wrench and the fore end tube. This will give the rod the proper support and give you enough leverage to loosen the tube. Once the tube is removed, the barrel and extension will slide out of the receiver along with the bolt.