model O1072CCS is a series 70 colt (Better trigger) Model: O1082CCS is a series 80 colt (added parts to make it safer if you drop the gun)

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model O1072CCS is a series 70 colt (Better trigger) Model: O1082CCS is a series 80 colt (added parts to make it safer if you drop the gun)

the big difference is the series 80 firing pin block safety Firing Pin Block Safety on model O1082CCS "The Colt Series 80, introduced in 1983, was formally known as the Colt MK IV Series 80 line of pistols. This model instituted a big change to the 1911 design: a new firing pin block safety system. This system featured an arrangement of internal levers and a plunger designed to ensure the firing pin was blocked until the trigger was pulled. The result was the gun could not accidentally discharge if the weapon was dropped on a hard surface. Colt's entire line of 1911-style pistols were switched to the new design in 1983, so they all bore the Series 80 designation --- even the Commander and Officer's ACP models." due to demand some of the competition models have been reoffered in series 70 model O1072CCS

Series 80 vs Series 70 Thomas. Nicely explained here : http://rangehot.com/series-70-vs-80-the-difference-is-more-than-you-think/

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Hi Thomas, The difference is the series 80 firing pin block safety Firing Pin Block Safety on model O1082CCS "The Colt Series 80, introduced in 1983, was formally known as the Colt MK IV Series 80 line of pistols. This model instituted a big change to the 1911 design: a new firing pin block safety system. This system featured an arrangement of internal levers and a plunger designed to ensure the firing pin was blocked until the trigger was pulled. The result was the gun could not accidentally discharge if the weapon was dropped on a hard surface. Colt's entire line of 1911-style pistols were switched to the new design in 1983, so they all bore the Series 80 designation --- even the Commander and Officer's ACP models." due to demand some of the competition models have been reoffered in series 70 model O1072CCS

the big difference is the series 80 firing pin block safety Firing Pin Block Safety on model O1082CCS
"The Colt Series 80, introduced in 1983, was formally known as the Colt MK IV Series 80 line of pistols. This model instituted a big change to the 1911 design: a new firing pin block safety system. This system featured an arrangement of internal levers and a plunger designed to ensure the firing pin was blocked until the trigger was pulled. The result was the gun could not accidentally discharge if the weapon was dropped on a hard surface. Colt's entire line of 1911-style pistols were switched to the new design in 1983, so they all bore the Series 80 designation --- even the Commander and Officer's ACP models."
due to demand some of the competition models have been reoffered in series 70 model O1072CCS