The standard TDA (traditional double action, or often called DA/SA) guns can be converted to the New Style DAO.
This means using MIM DAO parts (Hammer, trigger & sear) and the DAO action is going to have a longer trigger stroke than the Old Style DAO guns.
The old style DAO guns had longer slides to cover the old style DAO hammer being "located" (staged) more to the rear, when the gun was charged, which required a correspondingly shorter trigger stroke.
When they designed the new DAO parts to fit in the standard TDA frames & slides it required the DAO hammers be located rearward to a lesser degree when the gun was charged, so a correspondingly longer trigger stroke is required to fire the gun. This required a design change in the parts, as well, so you can't mix old (machined) and new (MIM) DAO parts in a gun.
There's a little more to it, of course, like using a "spacer" lever to replace the sear release lever and replacing the manual safety assembly with a firing pin retainer.
The factory can do the work. It's not exactly inexpensive, either.