This has been discussed in the past:
www.waltherforums.com
Read it all the way through, from the first post to the last. Take a look at all the posts in page 6 especially. Ask yourself if you really want this trigger in any pistol in your possession. I can put out detailed instructions as to how to get the same results with the factory trigger, but I will not under any circumstances because I am completely against modifications like this. Here's why:
www.waltherforums.com
If you have any questions, feel free to ask.
NEW - PPQ “Expert” modular trigger by Walther
Just saw it on Instagram: https://www.instagram.com/p/Buy28ezgWZQ/ Compatible with both steel and polymer framed PPQs, adjustable pre-travel, over-travel, and weight. Also different trigger shapes. Flat/curved. Pretty exciting!
Read it all the way through, from the first post to the last. Take a look at all the posts in page 6 especially. Ask yourself if you really want this trigger in any pistol in your possession. I can put out detailed instructions as to how to get the same results with the factory trigger, but I will not under any circumstances because I am completely against modifications like this. Here's why:

Necessity for a drop safety on the trigger
I just watched this linked video out of curiosity, and there was one section I thought I'd bring up on this forum. I've been on this forum for around 12 years now, and I've explained the purpose of the "lever" on the trigger and why it is important on the design of most striker fired pistols...
If you have any questions, feel free to ask.