Some people swear by upgrading the springs on the standard 18 round magazines.
Extra power extractor spring for all 75 Series models
Extended "Perfection" firing pin for the CZ models without firing pin blocks.
Easy-install trigger pin.
CGW Reduced weight firing pin spring.
Reduced weight firing pin spring for CZ75 series.
Floating trigger pin for all 75 series pistols.
Extended firing pin for CZ Shadow and Tactical Sport.
+10% extra power magazine spring for 18 round CZ SP-01 magazines.
+10% extra power magazine spring for 17 / 19 round Mec Gar magazines for SP-01 Shadow and Shadow 2
Stainless steel guide rod for SP-01 Shadow.