In the way of trigger systems, there are three options:

AS (Anti-Stress): Traditional Double Action
Basically a trigger system like a Sig, but the P99 is striker fired and hammerless. The AS also has the option of carrying in single action with the trigger forward (the anti stress mode)

QA (Quick Action): Pre-Cocked
Some what resembles the Glock or XD trigger, but slightly heavier with a longer reset.

DAO (Double Action Only)
Name says it all.

In terms of reliablity and function, I have found the P99 to be superior to the XD. I owned a 40SW XD for a time and would take the P99 over it hands down. Sold the XD.

With the AS or QA trigger, can work be done to shorten or lighten it up a bit? If so, who can do this work?

The P99 has a better fit, finish and look than the XD. The lack of a grip safety and a more ergonomic grip are pluses, too.

Originally Posted by scorpiusdeus

With the AS or QA trigger, can work be done to shorten or lighten it up a bit? If so, who can do this work?

There have been those that have changed the striker spring with a glock spring or cut off coils of the original P99 striker spring. Some have success and others do not. Swapping springs is really the most you can do, but I have hear very few stories that have not lead to FTF's. It is all trial and error.

Well, the QA is short - very short. But heavy. The A/S SA pull is light. But, not as short.

The length of travel, reset, and trigger weight is listed for all the P99 models on the following thread: Walther P99 Trigger Systems

Thanks for the info guys