U will probably have to order the Walther. They are hard to fine right now. Be aware that there are 3 triggers available - The A/S, QA and DAO. U want the A/S.
It is DA/SA, with a 3rd option to make the 1st shot the weight of the SA with the length of the DA. This is optional, however. U need not set it this way if U do not want. But the SA pull on the A/S is sweet.
I look at it this way - anything under $600 is fair. I paid $565 for my fullsize.