got it used two years ago and it developed slow leak and I couldn't have that so I started searching for leak.when I removed the barrel after removing three grub screws I noticed some,marks at the transfer port and around the brass part,it looks like the grub screw was left In too far and scratched it some.i didn't want to try to smooth it out and would rather get a new one...
Up to you, but brass is so soft. You can take the orings off and sand the scratches off and elongate the port and flare it like a funnel. It will be 100% as good as a new one. Post a pic if you like as long as it isn't deeply gouged it won't be an issue.