Can you take a nice photo from the back of the revolver looking towards the front? Two things come to mind:
1. Front sight not vertical, as has been mentioned, or
2. Barrel slightly canted. I've seen this several times, that the barrels were screwed in straight but somehow ended up canted to one side or the other. Probably bad threading.
If it was fine with the original barrel, then it seems strange that it suddenly away to one side without something being visible that is causing it.
Cheers!
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