hbaird: make sure you have the correct APEX kit for your pistol. The SD pistol spring set is not for use in a SW pistol, or vice versa. The pistols are different. While the SD series of pistols owes it's heritage to the SW9(SIGMA) series of pistols, the 2 guns are laid out differently. SW9/40VE series pistols has G***k like extractor set up. Rear slide plate must be removed to access extractor and related parts. The SD9/40VE series does not. Extractor is a pin and rocker style. Not easily removable w/o tools(punch and hammer), but give very good and reliable, long term service. S&W has used them for many years, and knows how to make them.