They DO make a difference! Take a look at this. On the left is a new Colt slide stop for a M1911. On the right is the same from Wilson Combat.
Click to enbiggen!
Take a look at the blue lines. The Wilson and STI were both hitting the lower resulting in scratching the bluing. I don't know if this little ridge results in not doing that, but I had no such issues before.
Take a look at the green lines and the red ones. Remember when I had to file the STI stop for class? The Colt stop seems to have additional contours to facilitate loading of the cartridge with no mechanical interference from the stop.

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