- Location
- Answering an idiot is idiotic
Any matte finish like this will mark easily if softer meals are rubbed on it.
It isn't the chrome that gets marked, the softer metal is deposited in the finish like fine sandpaper.
It would probably be easily removed, but for no purpose. It will look like that again after use anyway.

Looks like the electrolytic reaction that takes place at the interface between different metals.
If that's the case it isn't going to stop.
I'd be calling Wanstalls for a RMA (return merchandise authorization) number and then shipping the gun back for a full refund.
It's up to Wanstalls to deal with Chiappa.
Wanstalls dropped the ball big time when they didn't open the boxes and check the guns on a special order limited edition run of firearms BEFORE shipping them to customers.