Can't help on who did the work, but in my most humble opinion, it needs some Wipe-Out Foam and an overnight soak - probably remove all that copper fouling - until you shoot it again, that is.

I am surprised at the amount of copper in the muzzles.

Amazingly enough, the rifling lands appear to be matched in rotation. I've not seen that, or perhaps didn't recognize it before in other muzzle "shots". The coppering makes it quite vivid.

I think I would green or red Scotch-Brite the bore. Square of Scoth-Brite over a jag - tight, with some light lube like WD40- scrub maybe 30 strokes.

Auto-sol or Flitz on a very tight patch would also help and be less intrusive than the Scotch-Brite.

This should reduce the coppering.