I had the same problem with my Endeavor when I got it. I didn't find it though untill after my first range session and the gun had already shown that it could produce 1 inch groups at 100 yards. The spot is on top of one of the lands. I've used JB's bore paste and cleaned it numerous times with no luck. I was hesitant to send the barrel back because it shot so well, so I called TC and asked them about it. They told me that if at any time is started giving me trouble to send it back and they would replace the barrel no questions asked. Well, I still have the barrel and the spot is still there and yes, it is still producing 1 in groups with numerous loads. I think it is just a bit of chatter from the machining when making the barrel. I would suggest you give the gun a try and see how it shoots. If your not satisfied with the results then give TC a call and they'll take care of it. Let us know how it turns out.

I had a similar experience with a new Triumph. I finally got it spotless with JB. Afterwards, a friend related the same experience, he now uses foaming bore cleaner in new TC barrels.

Ultimately, if you are convinced the bbl is defective, send it to TC or return it to where you bought it.

YMMV

Cleaning brushes are used frequently. Oiled steel wool is used once to fix a problem, and it usually does.

shoot i still use steelwool to help remove lead build up.