ISMI STI Premium Magazine Spring Standard

Fits 140 mm 2011 STI/SVI Magazines

ISMI premium springs are manufactured exclusively with certified aerospace spec alloys; stainless alloy and chrome silicon. Each spring has been heat treated, stress relieved and shot peened to enhance performance and durability. These extra steps and quality materials ensure consistency and longevity many time that of standard music wire springs. All springs carry a 12 month manufacturer replacement warranty.