Some people swear by upgrading the springs on the standard 18 round magazines.
Extended "Perfection" firing pin for the CZ models without firing pin blocks.
Easy-install trigger pin.
CGW Reduced weight firing pin spring.
Stainless steel guide rod by CZ
Extended firing pin for models without firing pin block.
Reduced weight firing pin spring for CZ75 series.
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
Steel guide rod for Shadow.