Series 70 vs 80, the difference is more than you think.
I see a lot of use and misuse of the terms Series 70 and Series 80 when talking about Government Model and Commander pistols so I thought I would lay it out for you all. Once again I am not trying to upset anyone but just providing some correct information for you to do as you will.
In 1970 Colt changed a few things on their Government Model (five inch barrel) denoting it as Series 70 by adding a collet barrel bushing and accursizer barrel. The theory behind that was to improve accuracy with a tighter fit barrel bushing to the barrel’s muzzle without having to hand fit a standard solid barrel bushing. Now this worked pretty well but on occasion one of the fingers of the collet barrel bushing could bend or break.
In 1983 Colt introduced the Series 80 pistol going back with solid barrel bushing and a new firing pin safety. The Series 80 firing pin safety is actuated by pressing the trigger. This is not to be confused with the Swartz safety, which was designed by a Colt employee and actuated when the grip safety was depressed. Colt dropped the Swartz safety, due to unreliability, in the 1940s. The Series 80 consists of two added levers that, when the trigger is depressed, the levers push in a plunger in the slide moving it out of the way allowing the firing pin to move forward. The reason behind any firing pin safety is to prevent accidental discharge in the event the pistol is dropped on it’s muzzle from a height.
Another change with the Series 80 was to the hammer. Initially the 1911 had a half cock feature that incorporated hooks on the hammer, in case the hammer is being thumbed cocked and grip is lost the half cock hooks would stop the hammer from falling to the firing pin and discharging. The Series 80 hammer uses more of a quarter cock ledge, the thoughts on the hammer hooks is they could fracture and the ledge would not. If you have the hammer on the Series 80 quarter cock ledge and pull the trigger, the hammer will fall but with no where near enough force to discharge the pistol. From about 1983 to 1988 some of the Series 80 Government Models came from the factory with the collet barrel bushing but are still considered Series 80
As for Commanders and OACP pistols, they have always used solid barrel bushings so there is no such thing as a Series 70 Commander or OACP. They have been offered with the Series 80 firing pin safety so you have the option of Pre-Series 70 (no firing pin safety) or Series 80.
Colt did reintroduce the Series 70 pistol in 2001 and in 2002 introduced a stainless steel version, now original Series 70 Colts were never built with stainless steel and these new Series 70 reissue also incorporated a solid barrel bushing. Bear in mind these are not exact copies of the Series 70 but a reissue.
As far as trigger pull on the Series 80, it can be equally as good as a Series 70 above about four pounds and anyone who tells you different is uneducated on the matter or is lying to you.
So, there you go.