welder/welding machine question

This one does.... I don't know what you're considering "older". There is definitely a plug there for one and I remember there being a sticker over it bragging about the fact that it's there when I bought it brand new from what is now air has.
By older I meant, the Manual I selected from millers website was the first generation of that series since I didn’t have your serial number. I selected the first one on the list. Did you enter your serial number and download your manual? If there is “definitely a plug there for one” then why are you asking if your machine can run a spool gun?