It does not work, at least with p10c - Strike Industries Extended Magazine Plate For CZ

First, I love SI products. They always have good ideas at a reasonable price. I have bought a lot of things from them. But this time, no, the product is bad.
First, the plastic body of this extension can't hold the screw in place.
Second, after you load more than 18 rounds in, the follower will stuck at the bottom of the mag, which won't out. This thing broke the follower in my factory mag.
SI must have a redesign or rephrase of the production, because it does not with a P10C.
2 stars is for the look, it does look good, but sadly it doesn't work.