I have seen the crappy new finish on American and Austrian Glocks so his justification for backing out of the deal seems baseless, unless he really thought that the crappy new finish is restricted to the domestic Glocks. Either way, if that was important to him, he should have clarified it before the deal was reached.
For what it may be worth, I have managed to rust the old finish.
For what it may be worth, I have managed to rust the old finish.