Choose your spring from the drop-down menu under the price tag.
17 lb OEM for most standard pressure for Browning / FN Hi-Power, FEG, FM, Kareen MKI, Charles Daly, Ishapore
18.5 lb Recoil Spring (for high powered ammo)
15 lb Recoil spring (for lighter ammo and low power factor reloads that won’t cycle with standard 17 lb. recoil spring).