I have changed the stock recoil spring to a Wilson Combat 18.5# and I took the plastic grips off and put on a set of rubber Hogue's. This gun is one sweet shooter. As a matter of fact the CD FS Model is my CCW.
Mine is a two-tone standard model and I've changed the following:
1. Plastic grips with double diamond wood grips
2. extractor with Caspian extractor
3. rear sight with Bomar
4. extended slide stop with Ed Brown (standard)
5. recoil sprting with Wolff 16.5 lbs variable
Most of these modifications are purely for aesthetic purpose except for the extractor
and the recoil spring. With the latter two I now have a CD that is very reliable and accurate.