Which component houses the firing pin and extractor from a M9?
The part behind the bolt face. Also known as the slide.
The extractor assembly and the firing pin catch pin assembly are held in the rear of the slide near the safety lever. The firing pin (technically called a firing pin catch pin) itself is housed inside the firing pin catch pin assembly; the other components of the assembly are the firing pin catch, and the firing pin catch spring. The extractor is housed in the extractor assembly; the other components of the assembly are the extractor pin, and the extractor spring.
Old Man Dirt
It is like this- To find out what the proper name is I would suggest that you find some one who take some one apart and puts them back together and explains what they are doing. Youtube is one such source: https://www.youtube.com/watch?v=MCBqWDeDg4I