Extractor & Ejector & Slide Rear
I don't believe that extractors need to be "timed" (i.e. fit so tight that they can't rotate in the slide) for reliability and wouldn't want a gun that did require it, so the fact that all three show some degree of rotation in this part is a non-issue for me.
The only thing that really bears mentioning here is the large gap in the slide to ejector on the Yost gun. Like the gap in the grip safety, I do not know if this has any effect on reliability or function, but it bugs the hell out of me. I assume that when Y-B bought the Springfield (I didn't send them the gun) it came like that from the factory. The difference here is that I trusted them to go over the gun before they began work on it to check for things like this and they obviously didn't. Had I purchased the gun myself to send in I would have chosen another example, but Y-B proceeded to do $1300 +/- of work on a sub-standard gun.
The Brown and Wilson are even in my estimation.
This is another one that should be weighted more heavily, but again I do not know if it affect function and it does not appear to have done so to date.
Slide Rear
Brown 3
Wilson 3
Yost 1
Totals
Brown 21
Wilson 18
Yost 18
http://i134.photobucket.com/albums/q...eRearBrown.jpg
http://i134.photobucket.com/albums/q...RearWilson.jpg
http://i134.photobucket.com/albums/q...deRearYost.jpg