The 1911 MAINSPRING by ISMI is made from high-quality materials like chrome silicon, stainless steel, or chrome vanadium, ensuring durability and performance.
Designed to aerospace specifications, these mainsprings are heat treated, shot peened, and stress relieved to reduce spring set and maintain consistency.
Available in 19 lb. and 17 lb. rates, these mainsprings are suitable for the 1911 models Government and Commander, providing a lighter and consistent trigger pull.