Colt 1911 45 ACP Colt MK IV Series 80 Officer’s ACP 1911 .45ACP. Up for auction is a Series 80 Colt MKIV Officer;s ACP 1911 chambered in .45 ACP. The gun is in great shape, does have some scratches on the slide but overall is a really great gun. This is a great new range toy or home defense gun. The gun was manufactured in 1986 and come as is with no box and one 7 round magazine.