STI .22 conversion kit

[Tzygä]

I was shooting with my STI .22 conversion kit and firing pin just fly out of the firing pinhole.

How I can get firing pin back to the firing pinhole and get it stay there?

There is no firing pin stop plate to hold the firing pin in the hole.

Now firing pin won't go in the whole way. It stay out little bit. In the firing pinhole there is little jut/lump/pin and in the firing pin there is hole but you can't twist the firing pin to get around the jut/lump/pin in the hole.

Please is there anybody who will how to do it?