Tweco has made a gun that will plug right in. I I know that years ago they made a kit that would adapt a tweco gun to a miller machine. Before you do that make sure its not just the liner or to much tension on the drive roll. There might some tension setting on the shaft the spool slides onto...
Its gonna let you get farther away from your power supply. If you need to work inside a confined area 15 or 20 feet inside a cargo trailer etc.. up on a steel roof who knows. Think can I get my machine to the project? Just my 2 cents.
Tom