We offer 4 different mainsprings for 1911 and 2011 style pistols (full sized and commander):
15lb & 17lb are designed primarily for competition use and are wound from chrome silicon alloy.
19lb & 22lb are designed primarily for duty/carry/ self defense and are wound from stainless alloy because
it provides superior corrosion resistance.
Chrome silicon: 15MS (15lb) & 17MS (17lb)
Stainless alloy: 19SS (19lb) & 22SS (22lb)
15lb, 17lb, 19lb, 22lb