Horrible pitting can sometimes be reclaimed. I bought this as a parts gun & found it almost perfect inside. Took me probably 20 hours filing the pitting flat and polishing. Sent it to Turnbulls & got markings and blue replaced.

I did a revolver lightly pitted & it took a lot more time to prepare due to all the nooks and crannies, different curves, etc. Automatics are a lot easier because all flat sides and same curvatures around the edges.