I put Trijicons for my CW9. The rear sight was pushed in and out. The front sight is just twisted out to pop the polymer posts, and the new insert has two steel posts. One of the posts gets locktighted and a screw put in it . Imho it feels much more durable with the steel., like it supposed to be.
Love my CW9 and have it, night sights, and 2 extra mags for $530. I might have gotten pretty close to the price of a pm, or p series, but love the size of it and it is set up perfect for my tastes.
Also for guys with big hands, a Peirce pinky extention for thr PM9 works for the CW9 as well and gives just the right amount of room for my big fingers. All the while still being a dream to IWB CC.