In 1983 Colt introduced its MK IV Series 80 models, which had an additional passive firing pin safety lock that did not allow the pistol to fire if the trigger was not pulled to the end of its travel. The main modifications in the new model were a slightly heavier slide and a slotted collet barrel bushing. In the 1970s, the MK IV Series 70 Government Model superseded the standard Government Model. This model name is used today to denote the smallest versions of particular models, versions with shorter barrels and frames. Colt called this gun the “Officer’s Model.” It had a shorter length overall frame and used lightweight six-round magazines. Not long afterward, Colt introduced a pistol with a 3.5-inch barrel, looking to develop a firearm that would satisfy the concealed carry market. (The aluminum-framed gun was eventually, but not immediately, dubbed the “Lightweight Commander.”) Subsequently, Colt produced the same pistol with a steel frame and named this more traditional model a “Combat Commander.” Ever since, the term “Commander” has been used to designate 1911s that have 4.25-inch barrels. Early commercial Colt 1911 Government Model. Nevertheless, the shooting public readily accepted the Commander. It was a startling innovation at the time because the handgun mindset was mostly limited to steel. The new gun was the first to feature an aluminum frame.
Formerly, a 5-inch barrel had been the standard for full size semi-autos. This gun was essentially a shortened version of the A1 and was manufactured with a 4.25-inch barrel. Shortly after the war, Colt introduced a new gun, the Commander, which was based on the Colt 1911 Government design. The venerable Model 1911A1 was manufactured by Colt (and others during World War II) until 1971.
Officer: 3.5-inch barrel, 6 and 7+1 capacity.Commander: 4.25-inch barrel, 8+1 capacity.Government: 5-inch barrel, 8+1 capacity (originally 7+1).The differences between Colt 1911 Models in. The 1911 has come a long way since Colt's original 1911 Government Model.
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