The AIP 120% Enhanced Recoil/Hammer Spring for Hi-Capa 5.1/4.3 is 120% stiffer than the stock spring set that your airsoft gun comes with. This will give your gun a more realistic sound and feel by pushing the slide forward faster and pushing the hammer closed faster.
Model: 120% Enhanced Recoil/Hammer Spring for Hi-Capa 5.1/4.3
Package Includes: Recoil spring, hammer spring
Stiffer than stock spring
More realistic sound and feel