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, the spring is heat treated, shot peened, and stress relieved to reduce spring set and provide a lighter, consistent trigger pull.
It is available in 17 lb. and 19 lb. rates and fits 1911 model handguns in both Government and Commander sizes.