Help with Texan .45 Hammer Tube Assembly

Can someone please help me identify what parts are missing from a hammer tube assembly for a .45 Texan? I called Airforce and they were, well, wrong in what they told me. They told me the entire assembly is:

1. The actual hammer tube.
2. Hammer spring.
3. Hammer.
4. Power adjuster.

So here’s what I got:
833A288C-A7AF-4C15-9BCE-AE5D5B68869C.jpeg



However, I know at least this part I’m touching with my finger is missing and I don’t know what its called. Is that the striker? I need to know what to tell Airforce when I order from them tomorrow.

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Anything else missing? I’m quite surprised no good tear down videos or schematics exist for the Texan.