ISMI Recoil Spring 17 Lbs - 9mm/40/357 Glock Models - Best used for recoil management in most Glock pistols with standard ammunition - 124gr.- 145gr (9mm) and any extra power ammunition loading -...
Series Heavy-Duty Recoil Springs Government, Gold Cup, Para P14 - 18.5 lb Made combat tough to repeatedly take a pounding yet show a remarkably consistent performance every time a round is fired