The part on Saturdays what is it.
Is the striker from a Chinese Norinco T-97 bullpup rifle.
You can read more about it here.
http://www.thefirearmblog.com/blog/2013/11/24/norinco-t97-bullpup-returns-canada/
I have a complete set of pictures for this rifle coming from a friend in Canada and will post them soon.
how does the recoil spring interact with this? does the striker spring act as a partial recoil spring? is the striker spring working against the force of the recoil spring when released?