Thanks KyJim. And, in all fairness to Sig, I would guess that most persons would not have noticed the difference in the fit between the slide and frame. Unfortunately for me, I see "minor" things that others don't. My LGS owner can't believe the things I notice, but fortunately, we're still good friends. The only pistol I ever said that I wouldn't accept was a Browning HiPower. It looked as it the lock had banged up against it in shipping. That's one of the reasons I dislike those confounded cable locks.
In any case, I suppose I should have been in quality control somewhere. Instead, I'm a professor. My students don't particularly like my nit-picking either.
One of the earlier posters asked me if I wanted to shoot the pistol, or look at it. Both, obviously. I know that many of you can relate to that.
Bottom line regarding the Sig 1911 C3... it's accurate, beautiful, and I really like the commander slide and officer grip combination.