1911 Slide - to - Frame fit...Why?
I'm no pistolsmith but I have to ask.
To me, accuracy is exclusively a function of the precision with which the two features, the thing that the bullet comes out and the thing that holds the sights. So this means the barrel's lugs to the lug recesses in the slide and up front with the barrel to bushing and then bushing to slide. If the sights are mounted to the slide, you need only concentrate on these relationships, right?
In fact, I'd prefer to have a reasonable amount of play in the slide-to-frame.
Of course if your red dot is frame-mounted, then we do care about the aforementioned fit.