Amishfury did a good job of getting bore pictures. I found it very difficult to get my camera to focus on the rifling.
Anyway, let me add to this. Look for rings and shadows. Pictured is a nice new Colt made M1911 barrel. As it came from the factory on a series 80 Colt Targetmaster. Expensive pistol. As you can see the bore is bright, the edges of the lands square. However, see a ring? Rings and shadows near the muzzle are very bad things. Near the breech, like this, doubtful you will notice anything on paper, but I would not buy this barrel if I saw this. When you point the barrel at a light, rotate the barrel. If the shadow of a ring or spot moves with the rotation, the barrel should be investigated further.
I purchased a mint condition pre 64 featherweight barrel, screwed it on an action and it head spaced perfectly
and took it shooting. Accuracy was awful. Maybe 6 inch groups at 100 yards. After bedding and experimenting with free floating versus pressure bedding, I just looked down the front of the barrel. There was a shadow, less than an inch from the muzzle, a shadow that rotated as the barrel was rotated.
Somewhere in a previous past someone had shot the rifle with something in the muzzle, and bulged the barrel.
My bolt gun gunsmith took a reamer and counterbored the barrel. This was a last ditch effort, and it more or less worked. The barrel now shoots within two inches at 100 yards. Cost me more money than I wanted to put in that barrel.