Nine Ball TM Hi-Capa 5.1 Recoil Spring - High Speed
Nine Ball TM Hi-Capa 5.1 Short Stroke Recoil Spring
Nine Ball TM Hi-Capa 5.1 Shooters Recoil Spring - Soft
Guarder TM Hi-Capa 4.3 Series 150% Enhanced Recoil & Hammer Spring
KJW Hi-Capa 5.1 GBB Recoil Spring
WE Tech Hi-Capa 5.1 Recoil Spring #34