the only action job that a brand new COLT SAA may need is a a trigger job, with a weight of around 1,400/1,500 kg, which is perfect for everything. Some polishing and softening of corners in all moving parts will help to soften the action witouth touching the spring, which is stiff in Colts still today, and I am very glad that they still do so, as they have been doing the gun for 140 years now.
lets have in mind that the gun was designed to be cocked slowly and with care, take aim and shoot a mexican lanzer or an indian from a respectable distance, as from a short distance they would kill you without mercy with a spear, and they wanted a stiff reliable spring in the gun. They never thought about cocking and shooting at the speed of light when they designed, and adopted, this great machine, the COLT SAA, which is a mechanical wonder, a beauty of american design, and one of the most efficient guns ever made by man.
In general I dont want single action revolvers with a soft action, ie, a soft hammer cock. I want a fast hammer, and a stiff spring. A soft spring will slow the hammer fall, and that harms top accuracy. so I want just the opposite of todays´s trends. But I use my revolvers as they did in the XIX century, with XIX century mentality.
all the best