Originally Posted by Boz

I started calling it the Extractor after watching the "Cleaning And Lubricating" video from Brett248vista. In the video, Brett248vista called it the "Extractor".

Doing a search on the web I found that Ejector and Extractor were used interchangeably. So, I pulled the patent:

The breech sleeve inner surface includes a longitudinally-extending ejector hook groove 135 for capturing the ejector hook 77 against the barrel when the breech sleeve and the barrel are assembled together.

Since part number 77 is identified as the "Ejector Hook", that's what I'll be calling it in the future.

Thanks for the motivation.