Nice looking set!
On the Colt, is that a series-80? The problem with adjustable triggers and the series-80 is that people adjust overtravel too much and nicks develop on the firing pin plunger.
This could create a problem with the firing pin not moving, but the other parts seem to work fine.
Have you checked the series-80 parts in the slide?
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)