Sti/Infinity High Capacity Premium Magazine Springs - Ismi Sti Magazine Spring

Wound with high tensile, chrome silicon wire that's shot peened, heat treated, then stress-relieved for the longest service life possible, without cracking or failure.Fits STI/Infinity standard magazine, all calibers, up to and including 140mm +1 and +2 round base pads. Important when using 200 gr. bullets and heavier, 11 coils. Mfg: Ismi SPECS: Chrome silicon steel wire.