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When the M1991A1 was introduced, it was essentially a less finely-finished version of Colt's regular Series 80 Government Model. At about the same time, the rest of Colt's line was "upgraded" to "enhanced" status, with some bells and whistles, leaving the '91A1 as the only gun in the line-up which retained the G.I. configuration. Circa 2003, the military-style finish was changed to polished blue or stainless, so a newer 1991 is about a ringer for the pre-1991 Series 80 models.
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