Originally Posted by
farscott
I find Colt's use of the terms exceedingly inconsistent. The Series '70 marking originally meant the Accurizor barrel and corresponding collet barrel bushing. The Series '80 added the firing pin safety, while keeping the Series '70 barrel and bushing. Then Colt abandoned the Series '70 barrel and bushing and still called the guns Series '80. Clear as mud except for pistols with the Series '90 designation, including the Colt Double Eagle and the Defender, which both have Series '80 firing pin safeties and are otherwise quite a bit different. And now Colt calls guns without the firing pin Series '70, calls guns with the firing pin safety Series '80, but still markets the Series '90 for the Defender.