What the barrel looks like and how it shoots are often 2 very separate things.DON‘T buy second hand barrels. If you wander into the gun cleaning section of this forum and read some of the stuff written there you‘ll understand. RFD will sell you what they have. And I dare say only half of them have any idea of what a barrel looks like, or should look like, on the inside.
There are loads of used barrels that shoot perfectly well - if that was not the case there would no used rifles ever sold.
Actually shooting a used rifle is the only way to know how good or bad the barrel is
Cheers
Bruce