Did you read the thread?
These are barrels from Colt armorer's courses that have had the pins removed and replaced several times.
They are junk barrels with jacked up front sight bases and barrel nuts.
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scottryan and warpigM-4 have a good point. You need to figure out what the total cost will be by the time you are done "seeing" if it is any good. It is a judgement call. If you think the pins can be installed tight than keep it. If you have a doubt than sell it and go new. My concern is if the pins are still able to be installed tight than why remove it from the armorer course in the first place if it can still be used to teach.
What I find interesting is that I have never removed an FSB in a Colt Armorer Course. Is this something new?
If it makes any difference I don't see any real wear on the barrel as if the FSB was removed multiple times and the pins look fine (unless the pins were replace ever time). Would pictures be of any value at this point?