While "1911" serves to describe all of the decendents of Browning's design, here on the Colt forum we should make a greater distinction. M1911 and M1911A1 are military designations. The pistols made by Colt for commercial consumption are the Government Model, Commander, and Officers ACP (note: Officers Model is a .38 revolver). The M1991A1 is a Government Model variation that has a matte finish resembling the wartime M1911A1. No M1911's have been made since the mid-'20's and no M1911A1's since the mid-'40's, so all full-size Colts of even not-so-recent production are "Government Models". In the last ten years, Colt has gone from "Government Model" to "Enhanced Government Model" to "XS Government Model" to "XSE Government Model" - those are not necessarily official Colt designations, but what shooters and collectors call them. The M1991A1, in 5", 4.25" and 3.5" forms are the less-expensive versions of their like-dimensioned bretheren.