DOUBLE ACTION FIRING - P99, P990
The trigger is in the forward position when firing in double action mode. For a quick first shot when fine accuracy is not the most important concern, point the pistol atthe target and take aim. TO FIRE: pull the trigger all the way through the full length of its travel. This cocks the striker and fires the pistol all in one motion. This is the only way to fire a P990 pistol.
SINGLE ACTION FIRING - TRIGGER FORWARD - P99
If the striker is decocked, but you wish to fire the first shot single action, point the pistol in a safe direction, pull the slide back about 3/8 inch an let it go. This cocks the striker without ejecting the round in the chamber. When you have loaded the first round into the chamber, or if you have decocked the striker and then cocked it again without firing the pistol, the trigger is forward, in the same position as double action mode, BUT THE TRIGGER PULL WILL BE MUCH LIGHTER. TO FIRE: carefully take up the slack until the trigger clicks into the single action position, and then fire the pistol in single action mode.
SINGLE ACTION FIRING – TRIGGER REARWARD - P99
After you fire the first shot the striker is cocked and all shots are single action. In single action mode the trigger is much further back in the trigger guard and the TRIGGER PULL IS MUCH SHORTER AND LIGHTER. TO FIRE: squeeze the trigger all the way back.
WARNING: The single action trigger pull is much lighter and shorter than the double action pull. Be sure you look at the cocking indicator in the rear of the slide to see if you are in single action or double action BEFORE you put your finger on the trigger.
QUICK ACTION FIRING - P99 QA
The Quick Action (QA) Trigger of the P99QA differs from the standard P99 by offering a constant trigger pull for every round fired. If you pull the slide rearward and release, with a loaded magazine in the well, the gun will be loaded and ready to fire. Once loaded, pulling the trigger will move the striker to the rear and allow discharge. Depressing the take down button will decock the gun and render it unable to shoot. With the striker decocked, the gun will not fire. If the slide is slightly moved rearward on a decocked gun it will go into a ready to fire mode.
According to Walther's brochure for the QA, the QA has a decocker cleaning, disassembly, and safe storage of the gun without pulling the trigger.
For concealed carry, I'd go with DAO or the AS trigger. The QA trigger is similar to one on a Glock, though there is more resistance initially. For a different approach to a consistent, light, and long trigger pull, take a look at the
HK P2000SK.
Download P99 Manual