The barrel is not on any receiver. I'm referring to the block with the threaded hole for the scope mount. It's pressed, then pinned, with the hole to the pin peened. I'd have to drill out the pin, and then figure out how to press it off. I'm thinking I stick the barrel down a piece of thickwall pipe, with the pipe resting on the block, and throw a bottle jack on the threaded end then jack it into a brick wall.