Any one got bad barrel on Cricket?

In fact my friend has cricket bullpup .25. I have posted earlier about POI shift due to AT pressure change.

Today I shot the gun extensively and found that the pellet spirals. 

I changed fps and tried all fps all the way from 940fps to 830 fps. The spiral decreased but remained there. 

I took the barrel out and inspected it by naked eye.
The choke area has visible imperfections . There are down and up spots in the choke area.

I believe that it's a bad barrel.

Did any one experience a bad barrel from Cricket ever ?