Some people swear by upgrading the springs on the standard 18 round magazines.
Factory firing pin spring for CZ 2075 Rami
Wolff extra power (+25%) extractor spring for all 75 B Series models
New design trigger pin by CZ Custom
Stainless steel guide rod by CZ
Extended firing pin for models without firing pin block.
Reduced weight firing pin spring for CZ75 series.
+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.