CowCow M&P 150% Hammer Spring (GG08-10)
Forge Airsoft Hi-Capa/1911 Series Airsoft Pistol Hammer Spring
Guarder TM Hi-Capa 4.3 Series 150% Enhanced Recoil & Hammer Spring
Nine Ball TM Hi-Capa Hammer Spring - Red (GG08-03)
SCS Shockwave Enhanced 125% Recoil & Hammer Spring for Hi-Capa 4.3/5.1 (GG11-14)