The ML10776 is a fixed set of sights with a stake-on front sight for use on all ?80 & ?90 series Colt Pistols. MEPROLIGHT sights, like our other self-illuminated products & devices take maximum advantage of tritium light sources - the fail-safe, maintenance-free light sources that don?t require any external source of energy and provides up to 15 years of usable light under all weather conditions. MEPROLIGHT continues to offer the strongest guarantee in the industry for the usable light of our TRU-DOT sights. The tritium powered Sight is White in colour during day light and is green in low level light (night) The ML10776 was designed to fit the Colt 1911 government and Commander model and not Springfield model.