It reigned almost 70years in America. Designed in 1902 the colt.45 fought many battles between the world war 1st and Vietnam. But this bold colt gave its way for the large-calibre gun in the American army.The pentagon decided to replace colt45 as it couldn’t pace with the modern standard, also it was too heavy and slow.
During that time the new gun’s magazine had to hold at least 15 rounds and ammunition had to be of standard NATO nine mm parabellum with minimum recoil and the sidearm of the gun had to work I any latitudes. Each gun had to undergo 5000 round test,plunged in mud,water and sand. The guns were checked of its working in both salty atmosphere and high humidity conditions. It must work in temperature of 51degree C and above and below freezing point.Such kind of brutal test were undergone by Colt45 also.
American Smith Wessen 459,colt SSP,Spanish star28-M,German heckler and koch VP70 replaced colt45.