Ismi Extended Magazine Spring For Glock~
Ismi Extended Magazine Spring For Glock~, 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 9mm and .40 S&W high capacity magazines with +2 and +4 base pads. Mfg: Ismi SPECS: Chrome silicon steel wire.